... epoxy coated 3.standard:BS5163, BS5150,DIN3352 F4/F5,A gate valve 1.Material:ductile iron GGG500/7 2.coating:fusion bonded ... : GGG500-7 g) O ring : NBR h) Washer : Carbon steel or Stainless steel .5) Size: 50-400mm/2" - 16"6) Pressure grade ... adaptors, couplings, valves, manhole covers, dismantling joints, rubber O-rings, steel flanges, fasteners, pumps, motor shells and other castings and forgings ...