Use indoor, outdoor, underground. Used to retard heat gain & prevent condensation or frost formation on refridgerant lines, cold water plumbing and chilled water stystems. An Enviormenally Friendly, CFC Free, Flexible elastomeric thermal insulation. 2-5/8 ID X 1 X 6 FT WALL RUBBER PIPE INSULATION, PK6 (36 FT) Resistance to moisture and vapor flow.