DEWALT 1/4-in to 1/2-in Socket Adapter in the Socket Adapters department at Lowes.com
Kobalt NPT Brass Bushing Adapter 1/2-in (M) x 1/4-in (F) in the Air Compressor Fittings department at Lowes.com
1/2" Hose ID x 1/4" Hose ID Reducer Barb Mender/Splicer/Joiner/Union Fitting Brass Tubing Hose Adapter/Coupler 2pcs: Amazon.com: Industrial & Scientific
Amazon.com: uxcell 1/4 Inch Drive (F) x 1/2 Inch (M) Socket Adapter, Female to Male : Tools & Home Improvement
gotonovo Brass Pipe Fitting 1/4 Inch Female Pipe 1/2 Inch Male Reducer Adapter Air Hose Adapter Metal Pipe Adapter 2 Pack : Amazon.in: Home Improvement
NIBCO 1-1/2 x 1-1/4 in. PVC DWV Trap Adapter Fitting C480127HD112114 - The Home Depot
1/2" NPT Male to 1/4" NPT Male Brass Pipe Hex Reducer/Reducing Nipple Fitting/Adapter: Amazon.com: Industrial & Scientific