0887018 (Watts) | 1-1/4 - 2 Inch | 009 RP First Check Rubber Repair KitThis 1 1 4 to 2 Inch Watts 009 RP First Check Rubber Parts Replacement Kit is Used For Repairing The Parts to The Relief Valve 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 First Check Assembly O Ring, Disc Holder Assembly, Cover O Ring, And Sensing Passage O Ring. Watts 0887018