... .6 API,ANSI,ASTM,DIN,BS,JIS approved wafer type double disc check valveFeatures:1)Working temperature: -25*C~120*C2)Applicable ... End: DIN, ANSI, BS, ISO, JIS.Top Flange: ISO5211Face to Face: API609, ISO5752 series 20, BS5155Test&Check: API598 Double Disc Wafer Check Valve