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
Origin8 Threadless Quill Adapter converts 1-inch threaded to 1-1/8 thr – The Bikesmiths
1/8" Female NPT X 1/4" Push Connect Adapter - John Guest - Bulk Reef Supply
Insten 1 / 4 Audio to 1 / 8 Audio M / F Adapter (1/4" M to 1/8" 3.5mm F) - Walmart.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
Hosa Cable CMR210 Stereo 1/8 Inch to Dual RCA Adapter Cable - 10 Foot - Walmart.com
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
Amazon.com: KOOTANS 1/4 NPT x 1/8 NPT Male Solid Brass Nipples, Heavy Brass Pipe Adapter Fittings Hex Reducing Nipples Connectors 4Pieces : Industrial & Scientific
Everbilt 1/4 in. OD Compression x 1/8 in. MIP Brass Adapter Fitting 800729 - The Home Depot