12 Foot Adapter Cable, 3.5mm (1/8") Male Plug to 2 RCA Male Plugs
Brass, 3/8 in x 1/8 in Fitting Pipe Size, Reducing Adapter - 1DFY6|6-2 RA-B - Grainger
3/8" Male NPT x 1/2" Female NPT Brass Straight Adapter | Fastenal
Amazon.com: SiYear 3.5mm 1/8 inch TRS Plug to 6.35mm 1/4 inch Jack and 3.5mm Female to 6.35 Male Plug Gold Plated Set Audio Stereo Adapter Converter for Headphone, Microphone (4 -Pack) : Electronics
1-1/4" to 1-1/8" Headtube Headset Reducer / Adapter 1.25" to 1.125"
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
BrassCraft 3/8-in x 1/2-in Compression x Mip Adapter Fitting in the Brass Fittings department at Lowes.com