Polyethylene Pipe Fittings for Butt Fusion Welding to HDPE Pipe. Black PE3408/4710 Butt Fusion Fittings are manufactured and tested to meet ASTM D2513, ASTM D3261 and AWWA C906 regulations. They are compatible for heat butt fusion with black HDPE pipe or fittings manufactured from a like resin, including black HDPE pipe shown on previous page. SDR11 rated to 150 PSI @ 73 Deg. F. Not for flammable liquids or petroleum based products.