Rheem AP13045 Dielectric Union with 3/4-Inch Sweat and 3/4-Inch FPT, Brass/Zinc For best results, use only Rheem replacement parts for repairing your Rheem Water Heater Material: Brass/Zinc plated steel, Fitting 1 Type: Sweat, Fitting 1 Size -Plumbing Size (in.): 3/4 Kits which contain this part: AP1304512PK Fitting 2 Type: Pipe thread - Female, Fitting 2 Size NPT (in.): 3/4