0887180 (Watts) | 3/4 - 1 Inch | 009 RP Second Check Rubber Repair KitThis 3 4 to 1 Inch Check Rubber Parts Replacement Kit is For Series 009, Which 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 Second Check Assembly O Ring, Disc Holder Assembly, Cover O Ring, And Sensing Passage O Ring. Watts 0887180