Amazon.com: Universal 2.25" ID 2.5" ID Exhaust Pipe Adapter Connector Reducer 304 Stainless Steel 2.25 Inch to 2.5 Inch 2 1/4” ID to 2 1/2” ID kit : Everything Else
DEWALT Impact Ready 1/4-in to 1/2-in Standard Socket Adapter in the Socket Adapters department at Lowes.com
2" to 1-1/4" Hitch Reducer | Discount Ramps
DeWALT DW2547IR 1/4 in. Hex Shank to 1/2 in. Socket Adapter (Impact Ready) at Tractor Supply Co.
Amazon.com: KOOTANS 1/2 NPT Male x 1/4 NPT Male Solid Brass Nipples, Heavy Brass Pipe Adapter Fittings Hex Reducing Nipples Connectors 4Pieces : Industrial & Scientific
LTWFITTING 1/2 in. FIP x 1/4 in. MIP Brass Pipe Adapter Fitting (5-Pack) HF1028405 - The Home Depot