0887017 (Watts) | 3/4 - 1 Inch | 009 RP First Check Rubber Repair KitThis 3 4 to 1 Inch 009 RP First Check Rubber Parts Replacement Kit is Used For Repairing The Parts to The 3 4 to 1 Inch Relief Valve Which is Used to Prevent The Reverse Flow of Polluted Water From Entering Into The Potable Water Supply Due to Backsiphonage And or Backpressure. This Kit Consists of a Disc, Cover O Ring And Seat O Ring. Watts 0887017