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Exhibit 19

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This Insider Trading Compliance Policy (this “Policy”) consists of six sections:

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Preventing insider trading is necessary to comply with securities laws and to preserve the reputation and integrity of Watts Water Technologies, Inc. (together with its subsidiaries, the “Company”) as well as that of all persons affiliated with the Company. “Insider trading” occurs when any person purchases or sells a security while in possession of inside information relating to the security. As explained in Section III below, “inside information” is information that is both “material” and “non-public.” Insider trading is a crime. The penalties for violating insider trading laws include imprisonment of up to 20 years, disgorgement of profits, civil fines, and significant criminal fines of up to $5 million for individuals and $25 million for corporations. Insider trading is prohibited by this Policy, and violation of this Policy may result in Company-imposed sanctions, including termination of employment for cause.

This Policy applies to all officers, directors and employees of the Company. Individuals subject to this Policy are responsible for ensuring that members of their households also comply with this Policy. This Policy also applies to any entities controlled by individuals subject to the Policy, including any corporations, limited liability companies, partnerships or trusts (such entities, together with all officers, directors and employees of the Company, are referred to as the “Covered Persons”), and transactions by these entities should be treated for the purposes of this Policy and applicable securities laws as if they were for the individual’s own account. This Policy extends to all activities within and outside an individual’s Company duties. Every officer, director and employee must review this Policy. Questions regarding the Policy should be directed to the Company’s General Counsel.

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No officer, director or employee shall purchase or sell any type of security while in possession of material, non-public information relating to the issuer of the security, whether the issuer of the security is the Company or any other company.

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These prohibitions do not apply to:

No officer, director or employee shall directly or indirectly communicate (or “tip”) material, non-public information to anyone outside of the Company (except in accordance with the Company’s policies regarding the protection or authorized external disclosure of Company information) or to anyone within the Company other than on a need-to-know basis.

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“Insider trading” refers to the purchase or sale of a security while in possession of “material,” “non-public” information relating to the security or its issuer.

“Securities” includes stocks, bonds, notes, debentures, options, warrants and other convertible securities, as well as derivative instruments.

“Purchase” and “Sale” are defined broadly under the federal securities law. “Purchase” includes not only the actual purchase of a security, but any contract to purchase or otherwise acquire a

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security. “Sale” includes not only the actual sale of a security, but any contract to sell or otherwise dispose of a security. These definitions extend to a broad range of transactions, including conventional cash-for-stock transactions, conversions, gifts, the exercise of stock options, and acquisitions and exercises of warrants or puts, calls or other derivative securities.

It is generally understood that insider trading includes the following:

The materiality of a fact depends upon the circumstances. A fact is considered “material” if there is a substantial likelihood that a reasonable investor would consider it important in making a decision to buy, sell or hold a security, or if the fact is likely to have a significant effect on the market price of the security. Material information can be positive or negative and can relate to virtually any aspect of a company’s business or to any type of security, debt or equity.

Examples of material information include (but are not limited to) information about:

Moreover, material information does not have to be related to a company’s business. For example, the contents of a forthcoming newspaper column that is expected to affect the market price of a security can be material.

A good general rule of thumb: When in doubt, do not trade.

Information is “non-public” if it is not available to the general public. In order for information to be considered public, it must be widely disseminated in a manner making it generally available to investors through such media as Dow Jones, Business Wire, Reuters, The Wall Street Journal, Associated Press, or United Press International, a broadcast on widely available radio or television programs, publication in a widely available newspaper, magazine or news web site, a Regulation FD-compliant

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conference call, or public disclosure documents filed with the Securities and Exchange Commission (“SEC”) that are available on the SEC’s web site.

The circulation of rumors, even if accurate and reported in the media, does not constitute effective public dissemination. In addition, even after a public announcement, a reasonable period of time must lapse in order for the market to react to the information. Generally, one should allow two full trading days following publication as a reasonable waiting period before such information is deemed to be public.

“Insiders” include officers, directors and employees of a company and anyone else who has material inside information about a company. Insiders have independent fiduciary duties to their company and its stockholders not to trade on material, non-public information relating to the company’s securities. All officers, directors and employees of the Company should consider themselves insiders with respect to material, non-public information about the Company’s business, activities and securities. Officers, directors and employees may not trade in the Company’s securities while in possession of material, non-public information relating to the Company, nor may they tip such information to anyone outside the Company (except in accordance with the Company’s policies regarding the protection or authorized external disclosure of Company information) or to anyone within the Company other than on a need-to- know basis.

Individuals subject to this Policy are responsible for ensuring that members of their households also comply with this Policy. This Policy also applies to any entities controlled by individuals subject to the Policy, including any corporations, limited liability companies, partnerships or trusts, and transactions by these entities should be treated for the purposes of this Policy and applicable securities laws as if they were for the individual’s own account.

Insiders may be liable for communicating or tipping material, non-public information to a third party (“tippee”), and insider trading violations are not limited to trading or tipping by insiders. Persons other than insiders also can be liable for insider trading, including tippees who trade on material, non-public information tipped to them or individuals who trade on material, non-public information that has been misappropriated.

Tippees inherit an insider’s duties and are liable for trading on material, non-public information illegally tipped to them by an insider. Similarly, just as insiders are liable for the insider trading of their tippees, so are tippees who pass the information along to others who trade. In other words, a tippee’s liability for insider trading is no different from that of an insider. Tippees can obtain material, non-public information by receiving overt tips from others or through, among other things, conversations at social, business, or other gatherings.

Penalties for trading on or tipping material, non-public information can extend significantly beyond any profits made or losses avoided, both for individuals engaging in such unlawful conduct and their employers. The SEC and Department of Justice have made the civil and criminal prosecution of insider trading violations a top priority. Enforcement remedies available to the government or private plaintiffs under the federal securities laws include:

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In addition, insider trading could result in serious sanctions by the Company, including dismissal. Insider trading violations are not limited to violations of the federal securities laws. Other federal and state civil or criminal laws, such as the laws prohibiting mail and wire fraud and the Racketeer Influenced and Corrupt Organizations Act (RICO), also may be violated in connection with insider trading.

The size of the transaction or the amount of profit received does not have to be significant to result in prosecution. The SEC has the ability to monitor even the smallest trades, and the SEC performs routine market surveillance. Brokers and dealers are required by law to inform the SEC of any possible violations by people who may have material, non- public information. The SEC aggressively investigates even small insider trading violations.

The following are illustrations of insider trading violations. These illustrations are hypothetical and, consequently, not intended to reflect on the actual activities or business of the Company or any other entity.

Trading by Insider

An officer of X Corporation learns that earnings to be reported by X Corporation will increase dramatically. Prior to the public announcement of such earnings, the officer purchases X Corporation’s stock. The officer, an insider, is liable for all profits as well as penalties of up to three times the amount of all profits. The officer also is subject to, among other things, criminal prosecution,

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including up to $5,000,000 in additional fines and 20 years in jail. Depending upon the circumstances, X Corporation and the individual to whom the officer reports also could be liable as controlling persons.

Trading by Tippee

An officer of X Corporation tells a friend that X Corporation is about to publicly announce that it has concluded an agreement for a major acquisition. This tip causes the friend to purchase X Corporation’s stock in advance of the announcement. The officer is jointly liable with his friend for all of the friend’s profits, and each is liable for all civil penalties of up to three times the amount of the friend’s profits. The officer and his friend are also subject to criminal prosecution and other remedies and sanctions, as described above.

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The following procedures have been established, and will be maintained and enforced, by the Company to prevent insider trading. Every officer, director and employee is required to follow these procedures.

To provide assistance in preventing inadvertent violations of applicable securities laws and to avoid the appearance of impropriety in connection with the purchase and sale of the Company’s securities, all transactions in the Company’s securities (including without limitation, acquisitions and dispositions of Company stock (including by gift), the exercise of stock options and the sale of Company stock issued upon exercise of stock options) by executive officers, directors, Section 16 reporting persons and such other employees of the Company as are designated from time to time by the Board of Directors, the Chief Executive Officer or the General Counsel as being subject to this pre-clearance process (a “Pre-Clearance Person”) must be pre-cleared by the Company’s General Counsel, Deputy General Counsel, an Assistant General Counsel or such other person as the General Counsel may designate from time to time (each, an “Authorizing Officer”). Pre-clearance does not relieve anyone of his or her responsibility under SEC rules. For the avoidance of doubt, any designation by the Board of Directors of the employees who are subject to pre-clearance may be updated from time to time by the Chief Executive Officer or the General Counsel.

A request for pre-clearance may be oral or in writing (including without limitation by e- mail), should be made at least two business days in advance of the proposed transaction and should include the identity of the Pre-Clearance Person, the type of proposed transaction (for example, an open market purchase, a privately negotiated sale, an option exercise, etc.), the proposed date of the transaction and the number of shares or options to be involved. In addition, the Pre-Clearance Person must confirm (in a form or manner acceptable to the Authorizing Officer) that he, she or it is not aware of material, non-public information about the Company. The Authorizing Officer shall have sole discretion to decide whether to clear any contemplated transaction (the Chief Executive Officer or Chief Financial Officer shall have sole discretion to decide whether to clear transactions by the General Counsel or persons or entities subject to this policy as a result of their relationship with the General Counsel). All trades that are pre-cleared must be effected prior to the start of the next trading black-out period or such shorter period of time as may be designated by the Authorizing Officer unless a specific exception has been granted by the General Counsel (or the Chief Executive Officer or Chief Financial Officer, in the case of the General Counsel or persons or entities subject to this policy as a result of their relationship with the General Counsel). A pre-cleared trade (or any portion of a pre-cleared trade) that has not been effected prior to

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the start of a black- out period or the end of the trading period specified by the Authorizing Officer must be pre- cleared again prior to execution. Notwithstanding receipt of pre-clearance, if the Pre- Clearance Person becomes aware of material, non-public information or becomes subject to a black-out period before the transaction is effected, the transaction may not be completed.

None of the Company, the General Counsel, any Authorizing Officer, the Chief Executive Officer or the Chief Financial Officer or any of the Company’s other employees will have any liability for any delay in reviewing, or refusal of, a request for pre-clearance submitted pursuant to this Section IV.A. Notwithstanding any pre-clearance of a transaction pursuant to this Section IV.A, none of the Company, the General Counsel, an Authorizing Officer, the Chief Executive Officer or the Chief Financial Officer or the Company’s other employees assumes any liability for the legality or consequences of such transaction to the person engaging in such transaction.

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Additionally, no officer, director or employee of the Company shall purchase or sell any security of the Company during the period beginning two weeks before the end of any fiscal quarter of the Company and ending upon the completion of the second full trading day after the public release of earnings data for such fiscal quarter or during any other trading suspension period declared by the Company, except for purchases and sales made pursuant to the permitted transactions described in Section II.

Exceptions to the black-out period policy may be approved only by the Company’s General Counsel (or, in the case of an exception for the General Counsel or persons or entities subject to this policy as a result of their relationship with the General Counsel, the Chief Executive Officer or Chief Financial Officer or, in the case of exceptions for directors or persons or entities subject to this policy as a result of their relationship with a director, the Board of Directors).

From time to time, the Company, through the Board of Directors, the Company’s disclosure committee or the General Counsel, may recommend that officers, directors, employees or others suspend trading in the Company’s securities because of developments that have not yet been disclosed to the public. Subject to the exceptions noted above, all of those affected should not trade in the Company’s securities while the suspension is in effect, and should not disclose to others that the Company has suspended trading.

With the exception of the pre-clearance requirement, this Policy continues to apply to transactions in the Company’s securities even after termination of service to the Company. If an individual is in possession of material, non-public information when his or her service terminates, that individual may not trade in the Company’s securities until that information has become public or is no longer material.

Access to material, non-public information about the Company, including the Company’s business, earnings or prospects, should be limited to officers, directors and employees of the Company on a need-to-know basis. In addition, such information should not be communicated to anyone outside the Company under any circumstances (except in accordance with the Company’s policies regarding the protection or authorized external disclosure of Company information) or to anyone within the Company on an other than need- to-know basis.

In communicating material, non-public information to employees of the Company, all officers,

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directors and employees must take care to emphasize the need for confidential treatment of such information and adherence to the Company’s policies with regard to confidential information.

The following procedures are designed to maintain confidentiality with respect to the Company’s business operations and activities.

All officers, directors and employees should take all steps and precautions necessary to restrict access to, and secure, material, non-public information by, among other things:

Personnel involved with material, non-public information, to the extent feasible, should conduct their business and activities in areas separate from other Company activities.

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The Company has determined that there is a heightened legal risk and/or the appearance of improper or inappropriate conduct if the persons subject to this Policy engage in certain types of transactions. Therefore, officers, directors and employees of the Company shall comply with the following policies with respect to certain transactions in the Company securities:

Short sales of the Company’s securities evidence an expectation on the part of the seller that the securities will decline in value, and therefore signal to the market that the seller has no confidence in the Company or its short-term prospects. In addition, short sales may reduce the seller’s incentive to improve the Company’s performance. For these reasons, short sales of the Company’s securities are prohibited by this Policy. In addition, as noted below, Section 16(c) of the 1934 Act prohibits Section 16 reporting persons from making short sales of the Company’s equity securities, i.e., sales of shares that the insider does not

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own at the time of sale, or sales of shares against which the insider does not deliver the shares within 20 days after the sale.

A transaction in options is, in effect, a bet on the short-term movement of the Company’s stock and therefore creates the appearance that an officer, director or employee is trading based on inside information. Transactions in options, whether traded on an exchange, on any other organized market or on an over-the-counter market, also may focus an officer’s, director’s or employee’s attention on short-term performance at the expense of the Company’s long-term objectives. Accordingly, transactions in puts, calls or other derivative securities involving the Company’s equity securities, on an exchange, on or in any other organized market or on an over-the-counter market, are prohibited by this Policy.

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Purchasing financial instruments, such as prepaid variable forward contracts, equity swaps, collars, and exchange funds, or otherwise engaging in transactions that hedge or offset, or are designed to hedge or offset, any decrease in the market value of the Company’s equity securities, may cause an officer, director, or employee to no longer have the same objectives as the Company’s other stockholders. Therefore, all such transactions involving the Company’s equity securities, whether such securities were granted as compensation or are otherwise held, directly or indirectly, are prohibited by this Policy.

Purchasing on margin means borrowing from a brokerage firm, bank or other entity in order to purchase the Company’s securities (other than in connection with a cashless exercise of stock options through a broker under the Company’s equity plans). Margin purchases of the Company’s securities are prohibited by this Policy. Pledging the Company’s securities as collateral to secure loans is prohibited. This prohibition means, among other things, that you cannot hold the Company’s securities in a “margin account” (which would allow you to borrow against your holdings to buy securities).

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Rule 10b5-1 will protect directors, officers (for purposes of Section VI of this Policy, “officers” are deemed to be the Company’s officers who are Section 16 reporting persons) and employees of the Company from insider trading liability under Rule 10b5-1 for transactions under a previously established contract, plan or instruction to trade in the Company’s stock (a “Trading Plan”) entered into in good faith and in accordance with the terms of Rule 10b5-1 and all applicable state laws and will be exempt from the trading restrictions set forth in this Policy. The initiation of, and any modification to, any such Trading Plan will be deemed to be a transaction in the Company’s securities, and such initiation or modification is subject to all limitations and prohibitions relating to transactions in the Company’s securities. Each such Trading Plan, and any modification or termination thereof, must be submitted to and pre-approved by an Authorizing Officer, who may impose such conditions on the implementation and operation of the Trading Plan as the Authorizing Officer deems necessary or advisable. Compliance of the Trading Plan to the terms of Rule 10b5-1 and the execution of transactions pursuant to the Trading Plan are the sole responsibility of the person initiating the Trading Plan, not the Company or the Authorizing Officer.

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Rule 10b5-1 presents an opportunity for insiders to establish arrangements to sell (or purchase) Company stock without the restrictions of trading windows and black-out periods, even when there is undisclosed material information. A Trading Plan may also help reduce negative publicity that may result when key executives sell the Company’s stock. Rule 10b5- 1 only provides an “affirmative defense” in the event there is an insider trading lawsuit. It does not prevent someone from bringing a lawsuit.

A director, officer or employee may enter into a Trading Plan only when he or she is not in possession of material, non-public information, and only during a trading window period outside of the trading black-out period. Although transactions effected under a Trading Plan will not require further pre-clearance at the time of the trade, any transaction (including the quantity and price) made pursuant to a Trading Plan of a Section 16 reporting person must be reported to the Company promptly on the day of each trade to permit the Company’s filing coordinator to assist in the preparation and filing of a required Form 4. Such reporting may be oral or in writing (including by e-mail) and should include the identity of the reporting person, the type of transaction, the date of the transaction, the number of shares involved and the purchase or sale price. However, the ultimate responsibility, and liability, for timely filing remains with the Section 16 reporting person.

The Company reserves the right from time to time to suspend, discontinue or otherwise prohibit any transaction in the Company’s securities, even pursuant to a previously approved Trading Plan, if the Authorizing Officer or the Board of Directors, in its discretion, determines that such suspension, discontinuation or other prohibition is in the best interests of the Company. Any Trading Plan submitted for approval hereunder should explicitly acknowledge the Company’s right to prohibit transactions in the Company’s securities. Failure to discontinue purchases and sales as directed shall constitute a violation of the terms of this Section VI and result in a loss of the exemption set forth herein.

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Officers, directors and employees may adopt Trading Plans with brokers that outline a pre-set plan for trading of the Company’s stock, including the exercise of options. However, trades pursuant to a Trading Plan are subject to mandatory cooling-off periods under Rule 10b5-1. A cooling-off period is the time between when a Trading Plan is implemented and when the first trade is executed under the Trading Plan, thus minimizing the ability of an insider to benefit from any material non-public information.

Directors and officers of the Company cannot begin trading under a Trading Plan until the expiration of a cooling-off period that is the later of: (i) 90 days following adoption of the Trading Plan or material modification (see Section VI. C below for the definition of “material modification”) of the Trading Plan; or (ii) two business days following the disclosure of the Company’s financial results in a Form 10-Q or Form 10-K for the fiscal quarter in which the Trading Plan was adopted or materially modified (but not to exceed 120 days following adoption or material modification of the Trading Plan).

Employees of the Company who are not directors or officers of the Company cannot begin trading under a Trading Plan until the expiration of a cooling-off period that is 30 days after adoption or material modification of the Trading Plan.

Termination of Trading Plans should occur only in unusual circumstances. Effectiveness of any termination or modification of a Trading Plan will be subject to the prior review and approval of an Authorizing Officer. Termination is effected upon written notice to the broker.

A person acting in good faith may modify a prior Trading Plan so long as such modifications

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are made outside of a quarterly trading black-out period and at a time when the Trading Plan participant does not possess material, non-public information. Rule 10b5-1 imposes the above cooling-off periods in connection with material modifications to a Trading Plan. A material modification would be “[a]ny modification or change to the amount, price, or timing of the purchase or sale of securities,” including the substitution or removal of a broker that changes the price or date on which trades are to be executed. All modifications to a Trading Plan, whether or not material, must be approved by an Authorizing Officer.

Under certain circumstances, a Trading Plan must be terminated. This may include circumstances such as the announcement of a merger or the occurrence of an event that would cause the transaction either to violate the law or to have an adverse effect on the Company. The Authorizing Officer or administrator of the Company’s stock plans is authorized to notify the broker in such circumstances, thereby insulating the insider in the event of termination.

Although non-discretionary Trading Plans are preferred, discretionary Trading Plans, where the discretion or control over trading is transferred to a broker, are permitted if pre- approved by an Authorizing Officer.

An Authorizing Officer must pre-approve any Trading Plan, arrangement or trading instructions, etc., involving potential sales or purchases of the Company’s stock or option exercises, including but not limited to, blind trusts, discretionary accounts with banks or brokers, or limit orders. The actual transactions effected pursuant to a pre-approved Trading Plan will not be subject to further pre-clearance for transactions in the Company’s stock once the Trading Plan or other arrangement has been pre-approved.

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If required, an SEC Form 144 must be filled out and filed by the individual/brokerage firm in accordance with the existing rules regarding Form 144 filings, which must be made electronically through the SEC’s EDGAR system. The electronic Form 144 requires a filer selling through a Trading Plan to indicate the date of adoption of the Trading Plan at the bottom of the form. For Section 16 reporting persons, a Form 4 should be filed before the end of the second business day following the date that the broker, dealer or plan administrator informs the individual that a transaction was executed, provided that the date of such notification is not later than the third business day following the trade date. The Form 4 must indicate that the transaction was made pursuant to a Trading Plan.

Exercises of options for cash may be executed at any time. “Cashless exercise” option exercises through a broker are subject to trading windows. However, the Company will permit same day sales under Trading Plans. If a broker is required to execute a cashless exercise in accordance with a Trading Plan, then the Company must have exercise forms attached to the Trading Plan that are signed, undated and with the number of shares to be exercised left blank. Once a broker determines that the time is right to exercise the option and dispose of the shares in accordance with the Trading Plan, the broker will notify the Company in writing and the administrator of the Company’s stock plans will fill in the number of shares and the date of exercise on the previously signed exercise form. The insider should not be involved with this part of the exercise.

During an open trading window, trades differing from Trading Plan instructions that are already in place are allowed as long as the Trading Plan continues to be followed.

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The Company reserves the right to publicly disclose, announce, or respond to inquiries from the media regarding the adoption, modification, or termination of a Trading Plan and non-Rule 10b5-1 trading arrangements, or the execution of transactions made under a Trading Plan.

The transactions prohibited under Section V of this Policy, including among others short sales and hedging transactions, may not be carried out through a Trading Plan or other arrangement or trading instruction involving potential sales or purchases of the Company’s securities.

None of the Company, the General Counsel, the Authorizing Officer, the Company’s other employees or any other person will have any liability for any delay in reviewing, or refusal of, a Trading Plan submitted pursuant to this Section VI or a request for pre-clearance submitted pursuant to Section IV of this Policy. Notwithstanding any review of a Trading Plan pursuant to this Section VI or pre-clearance of a transaction pursuant to Section IV of this Policy, none of the Company, the General Counsel, the Authorizing Officer, the Company’s other employees or any other person assumes any liability for the legality or consequences of such Trading Plan or transaction to the person engaging in or adopting such Trading Plan or transaction.

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