Everbilt 1/2 in. x 3/8 in. Copper Pressure Fitting x Cup Reducer Fitting C600HD21238 - The Home Depot
Uxcell 22.6mm ID Copper Fitting, 4 Pcs Copper Coupling with Sweat Ends for Water Pipe Plumbing, HVAC - Walmart.com
Amazon.com: HVAC Wrot Copper Slip Coupling with Rolled Stop, 3/8 in. x 3/8 in. OD, 1/4 in Nominal (ID), C x C : Industrial & Scientific
5pcs 3/8 x 1/4 Inch ID Reducing Copper Coupling Fitting Straight with Sweat End | eBay
MECCANIXITY Straight Copper Coupling Fittings, 3/4 Inch ID Welding Joint for HVAC Air Conditioner, with Rolled Tube Stop Sweat Ends, 0.9mm Thick Pack of 5 - Amazon.com
MECCANIXITY Tee Copper Fitting 3 Way Welding Joint 3/8 Inch ID for HVAC Air Conditioner, Pack of 5 - Amazon.com