Amazon.com: TEKTON 3/8 Inch Drive (F) x 1/2 Inch (M) Adapter | SHA14102 : Everything Else
3/8" Male NPTF X 1/2" Male NPTF Reducing Adapter | MB Sturgis
1/2 to 3/8 Reducer Faucet Adapter - Compression Brass Pipe Fitting, 3/8 Male to 1/2 Male Supply Line Adapter for RV Kitchen Plumbing, Water Hose Pipe Connector with Rubber Washer, (2 Pack) - Amazon.com