Air Line Adapter for Airbrushes, 1/8 Inch BSP Male to 1/4 Inch BSP Female
Proline Series 1/8-in x 1/4-in Threaded Male Adapter Bushing Fitting in the Brass Fittings department at Lowes.com
6.35mm (1/4 inch) Male to 3.5mm (1/8 inch) Female Stereo Audio Adapter Converter for Guitar Headphones Amp , Gold Plated 2 Pack - Walmart.com
Amazon.com: Legines Brass Pipe Fitting, NPT Adapter 1/4" Female to 1/8" Male Reducing Adaptor 1200psi High Pressure (Pack of 2) : Industrial & Scientific
Amazon.com: NANYI 1/4 Inch Female to 1/8 Inch Male Stereo Headphone Adapter, Upgrade 6.35mm Jack Stereo Socket Female to 3.5mm Jack Stereo Plug Male for Headphone, Amp Adapte, Black 1-Pack : Electronics
1/4" Adaptor – 64 Audio
Threading Adapter, G 1/4 Male to NPT 1/8 Female
1/8" NPT Male to 1/4" MFL Male Flare Adapter
Amazon.com: Thread Reducer Bushing 1/4" Male x 1/8" Female Adapter Pipe Fitting with Stainless Steel 304 NPT : Industrial & Scientific
1PC BSP-NPT Adapter 1/8" Male BSPT to 1/4" Female NPT Brass Pipe Fitting Hexagon Plumbing Adapter Brass Pipe Fitting Mayit L: Amazon.com: Tools & Home Improvement