Watts T063231 0063231 3/4" LF007 Series Bronze Double Check Valve Backflow Preventer with QT Shutoff - This 3/4" lead free double check valve assembly backflow preventer helps prevent the backflow 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. Its compact modular design facilitates easy maintenance with a single access cover for in-line repairs. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as non-health hazards and for contaminants at the service line entrance. This assembly consists of a bronze body construction, NPT end connections, quarter turn ball valve shutoffs, top mounted test cocks, two in-line independent positive seating check modules, replaceable check discs and seats, and captured springs.