Wilkins 420 PVB Pressure Vacuum Breaker Click Here for Specification Sheet Quantity: Choose Model 420---3/4"---($93.99) 420-----1"---($93.99) RK-12-420----($36.99) RK--1-420----($43.99) RK-12-420 FK-($28.99) RK--1 Kit FK-($28.99)

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Wilkins 420 Pressure Vacuum Breaker Assembly 

Designed for installation on potable water lines to protect against both backsiphonage and backpressure of polluted 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. Designed for use under continuous pressure. Assembly shall provide protection where a potential non-health hazard exists.