**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