Reduced pressure zone assembly shall be installed at each cross-connection to prevent backsiphonage and backpressure of hazardous materials into the potable water supply. The assembly shall consist of a pressure differential relief valve located in a zone between two positive seating check valves. Backsiphonage protection shall include provision to admit air directly into the reduced pressure zone via a separate channel from the water discharge channel or directly into the supply pipe via a separate vent. The assembly shall include two tightly closing shutoff valves before and after the assembly, test cocks and a protective strainer upstream of the No. 1 shutoff valve. The assembly shall be a Watts Regulator Company series 909QTS.

WATTS 909M1-QT-S Bronze Backflow Preventer Reduced Pressure Zone Assembly With Quarter-Turn Ball Valve And Strainer, 2 IN, MNPT

Backflow Preventer Reduced Pressure Zone Assembly With Quarter-Turn Ball Valve And Bronze Strainer, Series/Model: Series 909M1-QT-S, Nominal Size: 2 IN, Connection Type: MNPT, Pressure Rating: 175 PSI, Temperature Rating: 33 - 140 DEG F, Bronze Body Material, Seat Material: 909 Celcon® Check, Industry Standards: CSA B64.4 Certified, UPC Listed, ASSE 1013, AWWA C-511-92, FCCCHR Of USC Manual Section 10, IAPMO Certified (UPC), SBCCI, 25-15/16 IN Width, 11-5/8 IN Height, Lead Free: No, Other Physical Dimension: 5-1/4 IN Depth