Marketing InformationThis 3/4 in lead-free dual check vacuum breaker backflow preventer with atmospheric vent prevent high hazard back siphonage backflow and low head backpressure (10 ft or less) from contaminating the potable water supply. It prevents backflow associated with hose connections when screwed directly to a sill cock, yard hydrant or wall hydrant. It consists of a lead-free brass body with two independently operating rubber and stainless steel check valves, with an atmospheric vent located between the them. It is inline field testable, non-removable and designed for non-continuous pressure applications. It is ideal for installation in service sinks, chemical dispensers, sill cocks and frost-proof hydrants. Maximum working pressure is 125 psi (10.6 bar).