... ) Length:3,4,6,7,10, Copper-aluminum connecting pipe(1)Copper tube:OD:1/4,&3/8,&1/2,&5/8 ... to produce quality risk, copper and aluminum pipe to connect both ends of the brass, to avoid the occurrence of this problem ... , easy to install, move machine: aluminum than brass soft, copper-aluminum connecting pipe copper tube design is 1.5 times the wall thickness ...