Copper-aluminum connecting pipe & air conditioner parts 1)Copper tube:OD:1/4,&3/8,&1/2,&5/8,&3/4, (2) ... Length:3,4,6,7,10, Copper-aluminum connecting pipe & air ... conditioner parts(1)OD:1/4,&3/8,&1/2,&5/8,&3/4,(2) ... install, move machine: aluminum than brass soft, copper-aluminum connecting pipe copper tube design is 1.5 times the wall ...