Safty valve Size: 1/2"-12" Rating: ansi 150lb-2500lb Material: wcb, lcb, wc6, wc9, c5, c12cf8, cf8m, cf3, cf3m, monel, hast c Design standard: api 520 Face to face standard: api 526 End connection standard: ansi b16.5, Test standard: api 527 Type: closed spring loaded full bore type, closed spring loaded full bore type with lever , twin spring loaded full bore type, closed spring loaded low lift type , spring loaded full bore type with lever , spring loaded low lift type with lever Be decided by the buyer