Watts LF009M3 QT S 3 4 3 4 IN Lead Free Reduced Pressure Zone Backflow Preventer Assembly, Quarter Turn Shutoff Valves, Bronze Strainer (Discontinued) Finish_Raw Brass The DiversiTech Concentric 2" Vent The DiversiTech Concentric 2" Vent makes it easier to have a two pipe installation for high efficiency furnaces The 2T2040GA is a compact metal cabinet for compatible indoor timer installations This 3 4 inch lead free reduced pressure zone backflow preventer assembly is designed to prevent the flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements Bronze Strainer