The Complete Repair Kit is compatible with the 1/2” and 3/4” Model 420XL and 420 Pressure Vacuum Breaker. Repair Kit components conveniently include one Canopy Screw, one Canopy, one Bonnet, one Bonnet O-Ring, one Relief Valve Assembly, one Air Inlet Disc, one Float, one Spring Retainer, one Check Spring, one Poppet, one Seal Ring, one Seat, and one Seat O-Ring. Repair Kits are sold as accessories for quick and simple repair needs, providing long-lasting protection from back siphonage of polluted and contaminated water into the potable water supply.