1/4" ISO to 1/8" Tubing Adapter - Next Advance - Laboratory Instruments
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
Steel Adapter Fitting, 1/8 Inch Male to 1/4 Inch Male NPT
Brass, 3/8 in x 1/8 in Fitting Pipe Size, Reducing Adapter - 1DFY6|6-2 RA-B - Grainger
Comprehensive Stereo 1/4" Male to Stereo 1/8" (3.5mm) SPP-MJS
Amazon.com: KOOTANS 4pcs Heavy Duty 1/4 NPT Male Thread to 1/8 NPT Female Thread Brass Reducer Hex Bushing Brass Fitting Pipe Hose Tube Adapter Convert : Industrial & Scientific
U.S. Solid Brass Hose Fitting, Adapter, 1/4" Barb x 1/8" NPT Male Pipe Fitting, 1/4"x 1/4", 3/8" x 1/4", 3/8"x 3/8",1/2"x 1/2", 3/4"x 3/4" - U.S. Solid