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1)it is used for connecting the indoor and outdoor air conditioner, 2).it can instead of copper connecting pipe - details see: https://www.machineto.com/air-conditioner-installation-kit-10208642

1)use resistance welding machine connection aluminum and copper together

2)use pvc heat shrinkable outside the aluminum pipe,to To prevent oxidation

3)outside with white twin PE insulated pipe with brass nut

1)product name:air conditoner copper-aluminum connecting pipe

2)material :mainly aluminum pipe,two ends are copper pipe

3)outside of pipe there is heat shrinkable to To prevent oxidation

4)and there is white twin insulation pipe ,also with brass nut

5)our normal thickness of aluminum and copper as follows:

1/4--aluminum 0.8mm,copper 0.7mm
3/8--aluminum 0.8mm,copper 0.7mm
1/2--aluminum 1.0mm,copper 0.7mm
5/8--aluminum 1.2mm,copper 0.8mm

6)the normal length is 3m/roll,4m/roll.5m/roll,6m/roll,..........

7)package:10sets/20sets/25sets/carton,also can according to your need