Everbilt 1/2 in. x 3/4 in. Copper Pressure Cup x FIP Female Adapter Fitting C603HD1234 - The Home Depot
Nickson Exhaust Adapter: 2 1/2" Inside Diameter, 2 1/4" Outside Diameter, 4" Long 548518 - Advance Auto Parts
Plumb Pak® 1-1/2" x 1-1/4" Plastic Reducing Tubing Adapter at Menards®
Grofry 1/4 inch NPT Male to 1/2 inch NPT Female Brass Pipe Fitting Reducer Adapter - Walmart.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
3/8 1/2 3/4 Drive Socket Reducer Air Impact Heavy Duty Ratchet Adapters New | eBay