1) high efficiency, energy saving healthy 2) the inside surface area increases 70~100% than plain copper tube China Ningbo Jintian Copper Tube Co.,Ltd. is a wholly owned sub-company of Jintian Group, it is specialized in HVACR copper tubes, environmental protection copper water tubes and copper fittings.The main products are: LWC, Pancake Coils, ACR Straight Tubes, Capillary Tubes, Copper Water ...