The Freeze Repair Kit is compatible with the 1/2” and 3/4” Model 420XL and 420 Pressure Vacuum Breaker. Repair Kit components conveniently include one Bonnet, one Bonnet O-Ring, one Relief Valve Assembly, one Air Inlet Disc, one Float, one Poppet, and one Seal Ring. 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.