... /4, (2) Length:3,4,6,7,10, Copper-aluminum connecting pipe(1)Copper tube:OD:1/4,&3/8,&1/2,&5 ... joints, leading to leakage of tube wear eye.Third, high cleanliness: as between copper and aluminum pipe without welding, but by cold access ... to install, move machine: aluminum than brass soft, copper-aluminum connecting pipe copper tube design is 1.5 times the wall thickness, not ...