1x100 250PSI Poly Pipe Has a clear core of HDPE providing visible proof of quality and the assurance that no regrind materials have been used to produce EndoPure Produced from HDPE resin, the same resin used for much of the gas pipe installed in the USA Entirely compatible with all fittings and connectors made for HDPE water pipe and tubing Has continuous consecutive footage marks every two feet to assist in installation UV stabilized for protection from sunlight deterioration