CRAFTSMAN 3/8-in to 1/2-in Standard Socket Adapter in the Socket Adapters department at Lowes.com
VFAUOSIT Brass Pipe Fitting, Water Hose Adapter, 3/8 inch Male x 1/2 inch Female water pipe adapter 3/8 to 1/2 pipe adapter Reducer Adapter 2 Pieces - - Amazon.com
Parker Expander Adapter 3/8 x 3/8 inch NPT - Brass - FG-B-3/8
Windtech M-16 Microphone Thread Adapter - 3/8 Inch-16 Female to 5/8 Inch-27 Male | Location Sound
On-Stage MA-200 5/8 inch Male to 3/8 inch Female Microphone Thread Adapter | Sweetwater
Everbilt 1/2 in. x 3/8 in. Copper Pressure Cup x MIP Male Adapter Fitting C604HD1238 - The Home Depot
Frizzlife Brass Feed Water Adapter for RO Water Filters, Ice Maker-3/8