Marketing InformationThe Freeze Repair Kit is compatible with the 1/2 and 3/4 in 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 back siphonage of polluted and contaminated water into the potable water supply.