... Copper-aluminum connecting pipe 1)Copper tube:OD:1/4,&3/8,&1/2,&5/8,&3/4, (2) Length:3,4,6,7,10 ... insulation, completely solve the copper-aluminum connecting pipe in the air conditioning industry, the practical application of the hidden problems; low cost, easy ... so do not need any treatment can achieve cooling pipe The cleaning requirements.4, good insulation properties: air conditioning is needed to ...