Made in the USA, Mur-lok™ linear low-density polyethylene (LLDPE) tubing from G.A. Murdock Inc., of Madison, S.D., is designed for use with all Mur-lok™ polypropylene quick-connect and other standard fittings used on POU drinking water systems. The polyethylene tubing offers excellent pressure and temperature ratings and has outstanding resistance to environmental stress cracking as it surpasses 1,000 hours of ASTM D1658 testing. The tubing is available in 1/4??, 3/8??, and 1/2?? OD tube sizes.