Anti-siphon aluminum vacuum breaker with EPDM backflow preventer and backflow check valve;Internal checks to prevent thermal migration;Solid brass body, valve stem cap, seat and stem ends;Satin nickel plated or oil-rubbed bronze body maintains attractive finish;Stainless steel mounting bracket with screws;Each valve air-tested at factory for leak-free quality;O-ring seals for easy operation;Ergonomic, rubber grip handle;Positive shut-off of hot water during cold flow;Patent pending