The Wilkins 420 Series Pressure Vacuum Breaker Assembly designed for installation on potable water lines to protect against backsiphonage of contaminated water into the potable water supply. Supplied with an integral anti-freeze relief valve to reduce the risk of valve damage under intermittent, non-seasonal freezing conditions **freeze-resistant, NOT freeze-proof**. Designed for use under continuous pressure. Test cocks are mounted on the ball valves, not the body. The design features a modular self contained check and replaceble seat. No special tools are required for servicing.
Full Repair kit comes with:
1 Seat Assembly
1 Float Assembly
1 Bonnet
1 O-Ring