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Water Safety & Flow Control



Check Stop Valves


Replacement Product: LFCS


1/2, 3/4, 1 in. (15, 20, 25mm)


Series CS Check Stop Valves are used in mixing/tempering valve applications at the hot and cold water inlet supply to protect against cross flow of hot and cold water in the system, and provide isolation of the mixing or tempering valve during servicing and maintenance. It performs as an isolation valve, check valve, and strainer. It consists of a bronze body construction with a union connection, threaded (-T) or solder (-S) inlet connection, threaded (-UT) or solder (-US) outlet connection, EPDM O-rings, stainless steel strainer screen, stainless steel spring, EPDM disc, and brass slotted adjustment screw. Series CS has a shutoff feature that facilitates mixing valve service and strainer maintenance, and is ideal for use with the Watts L111 and MMV thermostatic mixing valves. Maximum Working Pressure: 150psi (10 bar).

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Disclaimer: Watts product dimensions in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

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Additional Information

Danger – Scalding Lurks!

Every year, thousands of people suffer serious thermal shock or scalding injuries in their bathtubs, sinks and showers.

Click here for informative resources to help you protect against these dangers.

Learn About

Thermostatic Mixing Valves

Every year thousands suffer injuries as a result of hot water scalding and thermal shock injuries. Thermostatic mixing valves protect against these dangers.

To learn more about thermostatic mixing valves and how they work, click here.