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 deg F. At higher temperature working pressure is less. AWWA C-901.