Charlotte Pipe 3/4 in. x 1 in. PVC Sch. 40 MPT x S Reducer Male Adapter PVC 02110 0700HD - The Home Depot
NEIKO 30237A 3/4" Female to 1/2" Male Impact Adapter | Socket Adapter Reducer | For Use with Impact Guns/Wrenches, Breaker Bars or Ratchets - Drive Sockets - Amazon.com
PROTO, 1/4 in_3/8 in_1/2 in Output Drive Size, Square, Socket Adapter Set - 19C375|JHA4S - Grainger
3/8" to 1/4" 1/2 inch Drive Ratchet Converter Socket Adapter Reducer Air Imp UB | eBay