... ,oil,etc 4.SDR11/SDR17 HDPE pipe fittingHDPE Butt fusion flange adapter/stub FittingsSize From 20mm---500mm Our HDPE fittings including ... /Steel Transition Fittings,etc. Including Reducer,,Coupler,Reducing Tee,Equal Tee,End Cap,Cross Tee,Saddles,45 Elbows,90Elbows,etc.The size from ... . High quality and competitive price9. SDR11/SDR17 hdpe pipe fitting with flange