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3/8" to 1/4" 1/2 inch Drive Ratchet Converter Socket Adapter Reducer Air ImpYExg | eBay
BrassCraft 3/8 in. FIP and 1/2 in. FIP Brass Water Supply Adapter BCRP16 D - The Home Depot
Frizzlife Brass NPT Thread Pipe Fitting Converter-1/2 to 3/8 inch Comp