0794009 (Watts) | 2-1/2 - 3 Inch | Lead Free Dcda Second Check KitThis Second Check Replacement Kit is Used to Repair or Replace The Second Check on a 2 1 2 to 3 Inch Lead Free 007 Double Check Detector Assembly And is Used to Prevent The Backflow of Contaminated Water Into The Potable Water Supply. It Consists of a Seat, Seat O Ring, Disc Assembly, And Spring, Check Cage And Cover O Ring. It is Ideal at Referenced Cross Connections Identified as Non Health Hazard Applications. Watts 0794009