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