Pre-insulated with highly flexible paired, cross linked closed cell polyethylene; Easy to install. No glue, tape or messy powder; Easy to split the pair when connecting to air conditioning system units; Prevents condensation on piping and enhances system performance and efficiency; All sizes suitable for use with R410A and R32 high pressure refrigerants; Suitable for applications up 120°C; Material thermal conductivity of (0.033W/M.k at 20°C)