Sold as each. For protection of water heaters and storage tanks. Automatic reseating. 210 deg. temperature relief, starts to open at 200 deg. "White Coat":thermal element coating to isolate mineral buildup. AGA approved. ASME and CSA listed. 150 PSI *3/4" Connection. 3" Element Extension. Manufacturer number: 15836A-0150. Country of origin: United States. Distributed by Cash Acme Div. of Reliance Ww.