... Tianjin Zhonghua Innovatated Steel Tube Commercial Co., Ltd is specialized in HVACR copper tubes, environmental protection copper water tubes and copper fittings.The main ... , Pancake Coils, ACR Straight Tubes, Capillary Tubes, Copper Water Tubes, Copper Fittings, insulated Copper Tubes and Plasic-coated Copper Tubes. Being of the top-class ...