Amazon.com: 3 Pieces Vacuum Hose Adapter, 2-1/2 Inch to 1-1/4 Inch, 1-1/4 Inch to 1-3/8 Inch to 1-1/2 Inch, 1-3/8 Inch to 1-1/4 Inch Wet Dry Vacuum Converter Reducer Attachments for Vacuum Cleaner : Home & Kitchen
1-1/2" x 1-1/4" DWV PVC Trap Adapter - Female H x SJ D104-212
2 PCS 1/2 inch Square Drive to 1/4 inch Hex Female Socket Adapter Converter Chuck Adapter for Impact Air and Electric Wrench - - Amazon.com
Charlotte Pipe 1-1/2 in. x 1-1/4 in. PVC Schedule 40 MPT x S Reducer Male Adapter PVC 02110 1200HD - The Home Depot
Proline Series 1/4-in x 1/2-in Threaded Male Adapter Bushing Fitting in the Brass Fittings department at Lowes.com
CRAFTSMAN 1/2-in to 3/4-in Socket Adapter in the Socket Adapters department at Lowes.com