WW0888901, Watts, 6-8 Backflow Preventer First Check Valve Replacement Kit, 775 And 775Dcda

This 6-8 IN first check detector valve replacement kit for series 775 and 775DCDA prevents the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. This kit consists of a first check module, check module O-ring and a red silicone disc elastomer. It is designed for non-health hazard applications. It is used primarily on fire sprinkler lines when it is necessary to monitor unauthorized use of water.