Copper-aluminum connecting pipe & air conditioner parts 1)Copper tube:OD:1/4,&3/8,&1/2 ... Length:3,4,6,7,10, Copper-aluminum connecting pipe & air conditioner parts(1)OD:1/4,&3/8,&1/2,&5/8 ... take technology to complete, so also there is no other way of heat or other solution exists to complete the connection ... to install and transfer machines. Copper-aluminum connecting pipe & air conditioner parts