Copper Fittings for Air-Conditioner, Refrigeration, Water, General Plumbing, Gas, Heat-Exchangers. 1. Copper Fittings for Air-Conditioner, Refrigeration, Water, General plumbing, Gas, Oil, Heat-Exchangers.2. It has: Elbow, Coupling, Tee, Union,P-Trap.3. Standard: ANSI B16.22 and BS 8644. Package: Carton box.