PEX Tubing With Oxygen Barrier/EVOH - Radiant PEX GUY (3/4", 500 Ft) For Radiant Uses, 3/4" PEX by 500 Ft 25 Year Industry Standard Warranty Meets/Exceeds ASTM F876/877, CSA B137.5, DIN 4726 Standards UPC listed by IAPMO. PPI pressure rated at 79psi 200F, 100psi 180F, 160psi 73F