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This 1/2 inch x 600 foot coil of RadiantPEX Plus (TM) is used for radiant heating, snow melting, supply and return piping. It is an integral ethylene vinyl alcohol din standard O2 barrier that limits oxygen diffusion through the wall of the tubing. It has a protective polypropylene layer to the outside of the EVOH oxygen barrier. It is rated maximum temperature 200 degrees F and maximum pressure rating 160 psi.