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
Proline Series 3/8-in x 3/8-in Threaded Male Adapter Union Fitting in the Brass Fittings department at Lowes.com
1/2" Tube to 3/8" Tube Compression Adapter
1/2 to 3/8 Reducer Faucet Adapter - Compression Brass Pipe Fitting, 3/8 Male to 1/2 Male Supply Line Adapter for RV Kitchen Plumbing, Water Hose Pipe Connector with Rubber Washer, (2 Pack) - Walmart.com
Milwaukee SHOCKWAVE Impact Duty 1/4 in. x 3/8 in. Alloy Steel Square Socket Adapter 48-32-5031 - The Home Depot
Fitting, 3/8 Male X 7/16 Female Brass Adapter
JEGS 63248: Brass Adapter Fittings | 3/8 in. NTP x 5/8 in. -18 Inverted Flare Female | Fits 3/8 in. Hard Line | Sold Individually - JEGS