... unique design die-head 3, super efficient water cooling PPR plastic Pipe Extrusion lineSanitary and nontoxic, environment friendly; Erosion-resistant, no ... , thermal conductivity is only 0.5% of metal pipe, low drag index;Easy melting connection by special tools ... water, oil, and corrosive liquid, etc. Used as condenser pipe in aircondition system; Agriculture irrigation; Heat supply system, water ...