... 2.low leakagerate,high quality 3.OEM is welcome 4.CE High quality Anti-sweat worm gear butterfly valve Model of valve:D371XBody of valve : cast ... iron/wcb Disc of valve : Ni coated ductile iron, Nylon coated ductile iron,SS304,SS316, aluminum bronze Shaft of valve : 20# ... steel,SS420,SS304&316 Seat of valve : EPDM, wear-resistant EPDM, ...