WW0887906, Watts, 4 Backflow Rubber Repair Kit, Single Check, Series 709

This 4 IN rubber parts kit for single check series 709 helps to prevent the reverse flow of polluted water from entering into the potable water supply. This kit consist of a disc and a cover O-ring. It is ideal at referenced cross-connections identified in non-health hazard applications. Check with local inspection authorities for installation requirements.