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Lead Free 2 in. Top Access Double Check Valve Assembly Valve is designed for installation on potable water lines to protect against both back-siphonage and backpressure of polluted water into the potable water supply. Assembly provides protection where a potential non-health hazard exists. Double check valve assembly consisting of two independently operated spring-loaded center guided check valves. Backflow preventer comes complete with 2 full port resilient seated ball valves for shut-off along with 4 resilient seated ball valve test cocks.