Port Adapter - 1/4 x 3/8 Female Flare x Flare Adapter w/ Copper Gasket Brass - 105 - UR3-46 | HVACDirect.com
Midanya 1/4-Inch Female Pipe x 3/8-Inch Male Brass Pipe Fitting Reducer Adapter Air Hose Adapter Metal Pipe Adapter, 2 Pieces (1 Pair) - Amazon.com
3/8" to 1/4" 1/2 inch Drive Ratchet Converter Socket Adapter Reducer Air Imp.L3 | eBay
Amazon.com : Camera Screw Adapter Thread 1/4" Male to 3/8" Female and 3/8" Male to 1/4" Female Adapter Set for Camera Monitor, Tripod, Mount : Electronics
1/4'' to 3/8'' screw thread converter-adapter | TeleprompterPAD.com