Grey iron Casting,Fire hydrant body.GG30 or GG25,Green sand or Resin sand technology, ... machined part.Shot blast surface Features to Grey Iron Casting,Fire Hydrant Body: 1.Material :GG30 or GG25.2.Unit weight:25kgs ... :water supplying engineering industry,electric power engineering industry,ship industry,Fire hydrant and others.10.Representative product:gate valve body,butterfly valve ...