0889372 (Watts) | 2-1/2 - 4 Inch | 957/957RPDA/LF957RPDA First or Second Check Rubber Repair Kit | Red Silicone DiscThis 2 1 2 to 4 IN Check Rubber Parts Repair Kit For Series 957 And 957DCDA Helps Prevents The Backflow of Pollutants That Are Objectionable But Not Toxic, From Entering Into The Potable Water Supply. It Features a Check Module O Ring, Red Silicone Disc Elastomer And a E Clip. It is Designed For Non Health Hazard Applications. All Parts Are Genuine And Original to The Valve. Watts 0889372