WW0794025, Watts, 4 IN 709 Lead Free DCDA First Check Repair Kit

This first check valve kit is used to repair or replace the first check on a 4 inch lead free double check detector assembly and used to prevent the reverse flow of polluted water from entering into the potable water supply. This kit consists of a disc assembly, spring and a cover O-ring. It is ideal at referenced cross-connections identified in non-health hazard applications.