For use with potable water. 250 psi. CTS polyethylene pipe. PE 4710 high density, manufactured from select resins. NOT TO BE exposed to direct sunlight for extended periods. NOT FOR USE for compressed air systems. Use with compression fittings. Meets or exceeds ASTM D-2737. NSF approved for drinking water use. Working pressure based on PSI at 73.4 degrees Fahrenheit. At higher temperature working pressure is less.AWWA C-901