Submersible Poly Pipe - 200PSI, 1" Diameter, 400ft. EndoPure is produced from PE 4710 resin providing the strongest, most durable pipe available. The product made with PE 4710 resin has a 25% higher pressure rating than PE 3408 pipe. EndoPure has a clear core of HDPE providing visible proof of quality and the assurance that no regrind materials have been used to produce EndoPure. EndoPure is produced from HDPE resin with a 50-year track record of quality and performance. This is the same resin used for much of the gas pipe installed in the USA. EndoPure is entirely compatible with all fittings and connectors made for HDPE water pipes and tubing. EndoPure has continuous consecutive footage marks every two feet to assist in installation. EndoPure is UV stabilized for protection from sunlight deterioration. EndoPure printing is permanently embossed. EndoPure is NSF Certified and meets AWWA C901 standards.