Watts 0889372|WW0889372 - RK 957 957RPDA RC4 2-1/2 4

This 2-1/2 to 4 IN check rubber parts repair kit for series 957 and 957DCDA helps prevents the backflow of pollutants that are objectionable but not toxic, from entering into the potable water supply. It features a check module O-ring, red silicone disc elastomer and a E-clip. It is designed for non-health hazard applications. All parts are genuine and original to the valve.