DEWALT 1/4-in to 1/2-in Socket Adapter in the Socket Adapters 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
1/4-20 Adapter – MagnetMod
Amazon.com: FasParts 1/2" Female NPT FPT FIP to 1/4" Male MPT MIP Brass Pipe Adaptor Fitting Fuel/Air/Water/Boat/Gas/Oil WOG Military Grade : Industrial & Scientific