Casting,Pipe Fitting,Cast Pipe.GG20 or GG25,Green sand or Resin sand ... or machined parts.Shot blast surface. Features to Casting,Pipe Fitting,Cast Pipe. 1.Material :GG20 or GG25.2.Unit weight ... others.10.Representative product:gate valve body,butterfly valve body,ball valve body,Fire hydrant,Cast pipe,pump body.