The Complete Repair Kit is compatible with the 1” Model 420 and 420XL Pressure Vacuum Breaker. Repair Kit components conveniently include one Seat Assembly, one Float Assembly, one Bonnet, and one O-Ring. Although the Model 420 is discontinued, the Model 420XL Pressure Vacuum Breaker Assembly acts as a replacement. Repair Kits are sold as accessories for quick and simple repair needs, providing long-lasting protection from backsiphonage of polluted and contaminated water into the potable water supply.