RR Global Copper Tubes and Copper Pipes for Chiller, VRF / VRV AC, Ductable Air Conditioning and HVAC projects. RR Global Copper Tubes and Copper Pipes are available in 4 types. First, Level Wound Coil Copper Tubes in Outer Diameter of 4.76 mm to 15.88 mm. Second, Pancake Coil or Helical Coil Copper tubes in outer diameter of 4.76 mm to 22.22 mm. Third, Straight Copper Tube in outer diameter of 4.76 mm to 55 mm. Fourth, Copper Tube Coated with PVC in outer diameter of 4.76 mm to 19.05 mm.