Tp2 Phosphorus Deoxygenated Copper Coils, TU1 Oxygen-Free Copper Tubing, Copper Tubing for Air Conditioners and Refrigerators - 6.35, 9.52, 19mm. TP2 Copper Tubing, also known as Phosphorus Copper, is a seamless tube made by pressing or drawing TP2 phosphorus deoxygenated copper. The copper content of TP2 Copper Tubing is extremely high, reaching 95.91%, but approximately 0.015% of phosphorus is added during the melting process.