... , (2) Length:3,4,6,7,10, Copper-aluminum connecting pipe & air conditioner parts(1)OD:1/4,&3/8,&1/2 ... to protect; reliable, comprehensive specifications. Copper-aluminum connecting pipe in air conditioning manufacturing, air conditioning maintenance is the application.A long life: the ... same design pressure are 13.0Mpa, 13.0Mpa is the air pipe system 3 times the maximum working pressure, so the use ...