EZ-FLUID Plumbing 1" X 1/2" C X C Copper Reducer Coupling, LF Pressure Reducing Copper Coupling Fittings With Stop,Sweat Solder Copper Pipe Connection for Residential,Commercial. (10 Pack) - Amazon.com
Uxcell Reducing Copper Coupling Fitting Straight with Sweat End, 5/16 x 1/4 Inch ID for Refrigeration Adapter, Pack of 5 - Walmart.com