1. Red Copper Fittings For Refrigeration. 2. Red Copper Fittings:Elbow,Tee, Union, Couping. 1. Red Copper Fittings For Air Conditioner, Refrigeration.2. Red Copper Fittings: Elbow, Tee, Union, Coupling.3. Outside Diameter: 1/4"-4 1/8"4. Standard: ANSI B16.22 and BS8645. Package:Plastic Bag, then put into Carton Box. Red Copper Fittings