Specifications

56
Tech Support: 855-ONE-ZURN
www.zurn.com
OptionsTypical InstallationX Ref
Model 420 FNPT x FNPT end connections
Model 420FT Supplied with fast-test test cocks
Model 420SH Supplied with stainless steel handles
For Additional Information, reference WK-BPC catalog or visit
our web site.
Pressure Vacuum Breaker 420 Series
Features Applications
• 3/4”, 1”
• Pressure vacuum breaker consisting of an approved check valve, vac-
uum relief float, inlet and outlet full port resilient seated shut-off valves
and two full port resilient seated ball valve test cocks
• Integral relief valve reduces the risk of valve damage under non-seasonal
freezing conditions
• Drop-in replaceable seat
• Thermoplastic modular cartridge design
• All bronze body and corrosion-resistant internal parts
• Maximum pressure 175 psi
• Temperature range 33°F – 140°F
• With BSP threaded connections
• ASSE
®
Listed 1020, IAPMO
®
Listed, CSA
®
Certified
• Approved by the Foundation for Cross-Connection Control and
Hydraulic Research at the University of Southern California
Designed for installation on potable water lines to protect against backsiphonage of contaminated
water into the potable water supply. Supplied with an integral freeze relief valve to reduce the risk
of valve damage under intermittent, non-seasonal freezing conditions. Designed for use under con-
tinuous pressure. Assembly shall provide protection where a potential health hazard exists.
 Water hammer arrester (Model 1250)
 ZW3 Winterizer (Model ZW3)
 Quick test set (QT-SET)
Local codes shall govern installation requirements. Unless otherwise specified, the assembly shall be installed in accordance with the manufacturers’
instructions and the latest edition of the Uniform Plumbing Code. The assembly shall be mounted at a minimum of 12” (305mm) above the highest
piping or outlet downstream of the device. Install with adequate drain and sufficient side clearance for testing and maintenance. The installation shall be
made so that no part of the unit can be submerged. A pressure vacuum breaker cannot be installed where back-pressure could occur or where spillage
of water from vent could cause damage.
Accessories
INDOOR INSTALLATIONOUTDOOR INSTALLATION
12" MIN.ABOVE
HIGHEST OUTLET
MODEL 420
MODEL 420
DIRECTION OF FLOW
DIRECTION OF FLOW
12" MIN. ABOVE
HIGHEST OUTLET PIPING
DRAIN
WILKINS WATTS CONBRACO FEBCO
420 800M4QTFR 4V-500 767FR
OUTDOOR INSTALLATION
Backflow Preventers