... : Cast Iron, Ductile Iron, SS, WCB Certification: ISO, CE Doubel Flanged Butterfly ValveFeatures:1) Designed according to BS5155 Face to Face ... 5) Stem: SS410, SS416, SS304, SS316, carbon steel (WCB)6) Pin: SS410, SS416, SS304, SS316 7) KEY: carbon steel (WCB)8 ...