... WCB Certification: ISO, CE Doubel Flanged Butterfly ValveFeatures:1) Designed according to BS5155 Face to Face: ISO series 13 Flange drilling ANSI 125 ... iron, SS304, SS316, bronze, ductile iron with nylon coated4) Seat: EPDM, NB, BUNA-N, PTFE, VITON 5) Stem: SS410, SS416 ... steel (WCB)8) O ring: EPDM, NBR, BUNA-N 9) Bushing: PTFEFor catalog, pls visit www.metalvalves.com Butterfly Valves Double Flanged