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The Conbraco Model DC Double Check Valve Backflow Preventer is designed to prevent backflow by either backpressure or backsiphonage from a cross-connection between potable water lines and substances that are objectionable, but not a health hazard. It is an economical device that is easily repaired in the line. The device consists of two independently acting, spring-loaded poppet type check valves in an integral cast bronze body. Four test cocks and two shut-off valves which are quarter-turn, full-port, resilient-seated and ball type complete the assembly.