... inside surface area increases 70~100% than plain copper tubeChina Ningbo Jintian Copper Tube Co.,Ltd. is a wholly owned sub-company of ... products are: LWC, Pancake Coils, ACR Straight Tubes, Capillary Tubes, Copper Water Tubes, Copper Fittings, insulated Copper Tubes and Plasic-coated Copper Tubes. Being of ...