... (2) Length:3,4,6,7,10, Copper-aluminum connecting pipe(1)Copper tube:OD:1/4,&3/8,&1/2,&5 ... determined according to the needs of buyersCopper-aluminum connecting pipe features: The copper-aluminum connecting pipe electrochemical corrosion does not exist, no ... performance, easy to install, move machine: aluminum than brass soft, copper-aluminum connecting pipe copper tube design is 1.5 times the wall ...