3/8" barrier PEX is NSF certified for radiant floor heating applications (nsf-rfh) and is manufactured to ASTM F876/F877, CSA B137.5, DIN 4726, ANSI/NSF 14 and SDR 9 standards. It has a minimum bending radius of 4" and is pressure rated 100 psi at up to 180F. 25-year manufacturer warranty.