RK34-975XL - 3/4"-1" Model 975XL/XL2 Complete Rubber and Springs Repair KitThe Complete Rubber and Springs Repair Kit is compatible with the 3 4 1 Model 975XL and 975XL2 Reduced Pressure Principle Backflow Preventer. Repair Kit components include two Seal Rings, one #1 Check Spring, two Cover O Rings, one #2 Check Spring, one Relief Valve Spring, one Relief Valve Seal Ring, one Real Valve Diaphragm, and one Relief Valve Stem O Ring. The accessories within the kit allow you to speed up repairs, while lowering maintenance