Highlights: Anti-Siphon _ Frost Free, 1/2" F.I.P. OR 3/4" M.I.P. Lgth In : 10" Features integral vacuum breaker with vandal-resistant vented cap Backflow preventer, rubber coated green oval handle to help battle corrosion with stainless steel screw 1-piece O-ring bonnet (no more packing) Internal check valve is springless and works with water pressure ASSE 1019 and IAPMO listed