... aluminum, the expansion co-efficient a samll metal pipe with considerable strength, toughness, impact resistance.5. ... conductivity of metal pipes1/200 only, hot water pipe insulation for excellent energy saving effect.8. Light ... and connected to the use of high-quality copper insert, safe and reliable.12. Long time ... ,5058P02.63563x6,0058P02.75575x7,505 pex multilayer pipe for underfloor heating