Tundra brand polyethylene pipe Insulation is a flexible and easytoapply tubing product available in semislit and selfsealing styles It is packaged in cartons that feature the copper tube sizes in bold colorcoded print The SelfSealing version has yellow selfseal release liner that is both easy to see and peel Tundra brand polyethylene pipe Insulation is sold in all the common sizes required for home plumbing systems, including special fittings for tees and 90 deg elbows This chemically inert pipe insulation has a closedcell structure that allows it to function as an efficient insulator