0888522 (Watts) | 3/4 Inch | 009M3 RP First And Second Check Rubber Repair KitThis 3 4 Inch Check Rubber Parts Replacement Kit For Series 009M3 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 2 Check Discs, 2 Check Seat O Rings, And Cover O Ring. Watts 0888522