Features integral vacuum breaker with vandal-resistant vented cap. Backflow preventer. Self draining. Soft grip handle is green powder coated to help battle corrosion with stainless steel screw. Packing is made of graphite and cotton. Acme thread is in top of valve away from sand and other impurities in water. 1/4 in L hard copper (internal) connects stem and seat, and insures against deterioration from harsh water chemicals. Internal check valve is springless and works with water pressure. ASSE 1019 and IAPMO listed.