Amazon.com : Standard 3/8"-16 Female to 1/4"-20 Male Tripod Thread Reducer Screw Adapter (Brass) Precision Made (2 Pack) : Electronics
BrassCraft 3/8-in x 1/2-in Compression x Mip Adapter Fitting in the Brass Fittings department at Lowes.com
A-3-13MM Apex 3/8'' Socket And Ratchet Wrench Adapter, Metric
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) - - Amazon.com
3/8" NPT Female to 1/8" NPT Male Brass Pipe Adaptor/Adapter Straight Reducer/Reducing Coupling Male to Female: Pipe Fittings: Amazon.com: Industrial & Scientific
Husky 3/8 in. Female to 1/4 in. Male Drive Adapter HADPTR3814 - The Home Depot
3/8" Drive Male x 1/4" Hex Male Socket Adapter - 2" - IWAF26238B10 | Mac Tools
CRAFTSMAN 3/8-in to 1/2-in Standard Socket Adapter in the Socket Adapters department at Lowes.com
Brass, 3/8 in x 1/8 in Fitting Pipe Size, Reducing Adapter - 1DFY6|6-2 RA-B - Grainger
Threading Adapter, NPT 3/8 Male to G 1/4 Female, Stainless Steel
CRAFTSMAN 1/4-in to 3/8-in Socket Adapter in the Socket Adapters department at Lowes.com
Acetylene/Fuel Gas Adapter - A Size Male to 1/8 NPT Male Acetylene/Fuel Gas Adapter "A" Male-1/8" Male | Arc-Zone.com [WES-133 (B-7)] - $3.00 : Arc-Zone.com, Welding Accessories Store
Auray 5/8" Male to 3/8" & 1/4"-20 Female Combo AD-COMBO-B B&H
3/8 To 1/4 1/2 Inch Drive Ratchet Converter Socket Adapter Reducer Air Impact | eBay