This 3/4 inch lead free dual check vacuum breaker backflow preventer with atmospheric vent prevent high-hazard backsiphonage 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 in-line 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). WATTS®, 0792099, Backflow Preventer, Inline, Series: LFN9, 3/4 in Nominal, Female Hose Threaded x Male Hose Threaded End Style, 125 psi Pressure, 180 deg F, 4 gpm Flow Rate, Double Check Backflow, Media: Water, Brass Body, Chrome, 2-13/16 in H x 1-1/2 in W Dimensions, Import