www.pmmag.com/articles/88750-coated-copper-kamco-products
Coated Copper - KamCo Products
January 1, 2003

Gas-Tec by KamCo Products is a polyethylene coated copper tubing that provides added corrosion protection for natural gas and liquefied petroleum. It features continuous line-marking for clearer identification of tube contents, size and ASTM specification.
Circle 10