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 body maintains attractive finish;Stainless steel screws;Powder coated cast aluminum handle;Lock shield cap;AFG teflon with graphite packing for easy maintenance;Standard “OO” size seat washer;Each valve air-tested at factory for leak-free quality;Spout aligning mark with manufacturer’s date code