... , Stainless Steel, Casting Iron 4.Cer.: ISO Pipe FittingType:a). Forged Fitting(Socket Weld & Threaded): Tee, Elbow, Reducer, Cap, Coupling/Socket, Plug ... , Nipple and so onb). Butt Welded Fitting(Seamless or Welded): Tee, Elbow, Reducer, Cap, Coupling/Socket, Plug ...