Wilkins: 3/4" 420XL Series Lead Free Freeze Relief Pressure Vacuum Breaker
Ideal for use where Lead-Free* valves are required. 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. Designed for use under continuous pressure. Assembly shall provide protection where a potential health hazard exists.