Manfrotto 015 Female 3/8" to Male 1/4"-20 Adapter 015 B&H Photo
Threading Adapter, NPT 1/4 Female to NPT 3/8 Male
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
Adapter, Brass, Compression, Female, 7/8 x 3/4 In. | True Value
LTWFITTING 3/8 in. Flare x 3/4 in. MIP Brass Adapter Fitting (5-Pack) HF4861205 - The Home Depot
MILD STEEL Male Hex Adaptor 1/4 by 3/8 Bsp, For Gas Pipe, Grade: Carbon
SIRUI TA-14 thread adapter 3/8" to 1/4" o. 1/4" to 3/8" – SIRUI Optical GmbH
1/4" 3/8" 1/2" 3/4" NPT BSPT Male to Female Thread Brass Reducer Bushing Reducing Pipe Fitting Coupler Connector Adapter - China Parker Tube Fittings, Hydraulic Tube Fittings | Made-in-China.com