... "~12" 1.0/1.6/2.0/2.5MPa PTFE liner ring inside, corrosion resistant. ISO, API, ASTM, ANSI, DIN, BS,JIS ... : SS316, Stainless Steel.Seat: PTFE, NBR.Bushing: PTFE, Bronze.O-Ring: EPDM, Fluorine RubberStandard:1) Design Standard: MSS SP-67, API609 ...