... : Cast Iron, Ductile Iron, SS, WCB Certification: ISO, CE Doubel Flanged Butterfly ValveFeatures:1) Designed according to BS5155 Face to Face ... ), stainless steel3) Disc: ductile iron, SS304, SS316, bronze, ductile iron with nylon coated4) Seat: EPDM, NB, BUNA-N, PTFE, VITON 5 ... ) Bushing: PTFEFor catalog, pls visit www.metalvalves.com Butterfly Valves Double Flanged