Rubber-plastic heat insulation pipe Wall thickness 3/8", 1/2", 3/4", ... Diameter 1/4"to 4-1/2" Rubber-plastic heat insulation pipe Wall thickness 3/8", 1/2", 3/4", ... central air conditioning engine room, wind pipeline heat preservation and heat insulation and etc. It has the good resisting dew-together capability, ... , Low water vapor transmissibility, rich plasticity, construct convenience and etc.