... of aluminum, the expansion co-efficient a samll metal pipe with considerable strength, toughness, impact resistance.5. Corrosion-resisitant, non- ... water pipes and connected to the use of high-quality copper insert, safe and reliable.12. Long time life: the ... used for reclaimed water project;6. Piped used for central air conditioner, fan coil;7. Industrial pipes used for oil transportation and ...