... .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,SS304,SS316, aluminum bronze Shaft of valve : 20# steel,SS420,SS304&316 Seat of valve : EPDM, wear-resistant EPDM,NBR,PTFE ... ,Viton Handle of valve : iron, punching malleable iron, ...