Quarter inch Adapter, 6.35mm (1/4 inch) Male to 3.5mm (1/8 inch) Female Headphone Jack Plug, Gold Plated, 6 Pack - - Walmart.com
Origin8 Threadless Quill Adapter converts 1-inch threaded to 1-1/8 thr – The Bikesmiths
Amazon.com: VCE 1/4" to 1/8" Adapter, 3.5mm 1/8 inch Male to 6.35mm 1/4 inch Female Audio Jack Gold Plated Adapter for Amplifiers, Guitar, Home Theater Devices, Laptop, Headphones - 8 inch : Electronics
Pressure Gauge Adapter, 1/8 BSP Male & Female, 1/8 NPT F Tee - Pegasus Auto Racing Supplies
LTWFITTING 1/8 in. O.D. Comp x 1/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF682205 - The Home Depot
CRAFTSMAN 1/2-in to 3/8-in Standard Socket Adapter in the Socket Adapters department at Lowes.com
Williams Sound 1/8" Stereo Jack to 1/8" Mono Plug Adapter ADP
Amazon.com: VCE 1/4" to 1/8" Adapter, 3.5mm 1/8 inch Male to 6.35mm 1/4 inch Female Audio Jack Gold Plated Adapter for Amplifiers, Guitar, Home Theater Devices, Laptop, Headphones - 8 inch : Electronics
Amazon.com: KOOTANS Forged Brass Reducing Hex Nipple, 1/4'' NPT Male x 1/8'' NPT Male Thread Adapter Brass Pipe Fitting Connector Couplings (Pack of 4) : Industrial & Scientific
1” 8TPI to 1-1/4” TPI Spindle Adapter - Conestoga Works
Value Collection - Grease Fitting Adapter: 1/4-28 Male NPT, 1/8″ Female NPT - 61833844 - MSC Industrial Supply
Origin8 Threadless Quill Adapter converts 1-inch threaded to 1-1/8 thr – The Bikesmiths