Utilize copper for consistent and high-quality performance. Copper is user-friendly and offers great thermal conductivity, resistance to corrosion, and durability. It comes in two main types: plumbing tube and air conditioning/refrigeration (ACR) tube, as well as drawn (hard) and annealed (soft) tempers. Copper tubing is also offered in a variety of diameters (ranging from 1/8 inch to 12 inches) and wall thicknesses. A wide selection of fittings are available for various design needs.