Qingdao Hongtai Copper Tube Co.,Ltd mainly specializes in producing and research and development various copper tubes since 1993, it is the professional manufacturer of R410A Air Conditioning Copper Pipe?Copper Water pipe?Inner Grooved Copper Pipe ?Pancake Copper Coil ?Medical Gas Copper Pipe?OD more than 76mm Straight Copper Pipe ?Radiator Copper ...