... , 3.For gas,water,oil,etc 4.SDR11/SDR17 HDPE pipe fittingHDPE Butt fusion flange adapter/stub FittingsSize From 20mm---500mm ... ,,Coupler,Reducing Tee,Equal Tee,End Cap,Cross Tee,Saddles,45 Elbows,90Elbows,etc.The size from dia 20mm to 1000mm ... . OEM accept8. High quality and competitive price9. SDR11/SDR17 hdpe pipe fitting with flange