Kobalt NPT Brass Bushing Adapter 1/2-in (M) x 1/4-in (F) in the Air Compressor Fittings department at Lowes.com
M14 Female To 1/2 Inch 1/4 Inch M10*1 Male Pressure Gauge Fittings,m20 Female To 1/2 Inch 1/4 Inch Male Pressure Gauge Adapter - Pipe Fittings - AliExpress
CRAFTSMAN 3/8-in to 1/2-in Standard Socket Adapter in the Socket Adapters department at Lowes.com
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
Amazon.co.jp: Screwdriver Bit Conversion Adapter 1/2 Drive to 1/4 Hex Shank Set of 2 : DIY, Tools & Garden