WW0888910, Watts, 3-4 IN Backflow Preventer Complete Rubber Parts Valve Replacement Kit, Series 775 And 775DCDA

This 3-4 IN rubber parts replacement kit for series 775 and 775DCDA prevents the backflow of fire protection system substances from being pumped or siphoned into the potable water supply. It consists of a first and second check assembly O-ring and first and second check disc. It is designed for installation on applications identified by local authorities as non-health hazard, such as on fire protection systems.