DEWALT 1/4-in to 1/2-in Socket Adapter in the Socket Adapters department at Lowes.com
Reducer 1/2" Female to 1/4" Male Npt Pipe Adapter Male Female Thread Water Oil | eBay
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