Zurn 3/4" Wilkins 420XL Pressure Vacuum Breaker Assembly w/ Integral Anti-Freeze Relief Valve (Lead Free)

**Lead Free Application This Wilkins Series 420 pressure vacuum breaker assembly is designed for installation on potable water lines to protect against back-siphonage 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. Designed for use under continuous pressure. Assembly shall provide protection where a potential health hazard exists. Standards Compliance ASSE® Listed 1020 IAPMO® Listed CSA® Certified Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California Materials Main valve body: Cast Bronze ASTM B 584 Elastomers: Silicone (FDA Approved), Buna Nitrile (NSF Listed) Polymers: Polypropylene (FDA Approved), Delrin (NSF Listed), Noryl (NSF Listed) Springs: Stainless Steel, 300 Series