WW0888909, Watts, 6-8 Backflow Preventer Second Check Rubber Parts Replacement Kit, 775 And 775Dcda

This 6-8 IN second check 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 second check assembly O-ring and check disc. It is designed for installation on applications identified by local authorities as non-health hazard, such as on fire protection systems.