Aluminum Adapter, 3/4" Male NPT to 1/2" Male NPT | Air & Hydraulic Equipment,Inc.
TEKTON 3/4 in. Drive (F) x 1/2 in. Drive (M) Impact Reducer 47823 - The Home Depot
PROTO, 1/4 in_3/8 in_1/2 in Output Drive Size, Square, Socket Adapter Set - 19C375|JHA4S - Grainger
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
3/8" to 1/4" 1/2 inch Drive Ratchet Converter Socket Adapter Reducer Air Imp UB | eBay
3/4" x 1/2" Sch 40 PVC Reducing Male Adapter - Mipt x Soc 436-101
Amazon.com: Joywayus 1/2" NPT Thread Female × 3/4" G Thread Male Brass Pipe Fitting Adapter : Industrial & Scientific