ASSE 1019 and C-UPC approved;Anti-siphon vacuum breaker with backflow check valve;Aluminum vacuum breaker cap with increased durability;Integral cast flange with built-in drainage pitch;Enclosed screw holes easily secure mounting screws;Solid brass body, valve stem cap, seat and stem ends;Satin nickel plated body maintains attractive finish;Stainless steel seat washer screw and handle screw;Powder coated cast aluminum handle;Durable ACME threads secure stem at seat end;Lock shield cap for stronger valve design;AFG teflon with graphite packing for easy maintenance;Standard "OO" size seat washer;Spout aligning mark;Slim seat inlet for easier installation