The Complete Repair Kit is compatible with the 1-1/4” and 2” Model 950XL Double Check Backflow Preventer. Repair Kit components include two Cover O-Rings, two Check Springs, two Poppets, two Seal Rings, two Seal Ring Retainers, two Retaining Bolts, two Check Seats, and two Check Seat O-Rings. Repair Kits are sold as accessories for quick and simple repair needs extending the life of your backflow preventer.