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
NANYI 1/4'' Male to 1/8'' Female Stereo Headphone Adapter Connect Cable, Upgrade 6.35mm Jack Stereo Socket Male to 3.5mm Jack Stereo Plug Female for Headphone, Amp Adapte, Black 1-Pack - Walmart.com
Brass Adapter, Male (1/8-27 NPT), Female (1/4-18 NPT) – AGS Company Automotive Solutions
LTWFITTING 1/8 in. OD Comp x 1/8 in. FIP Brass Compression Adapter Fitting (5-Pack) HF662205 - The Home Depot
Pressure Gauge Adapter, 1/8 BSP Male & Female, 1/8 NPT F Tee - Pegasus Auto Racing Supplies
Earl's 961604: Steel AN to Pipe Adapter Fitting -4AN To 1/8" NPT - JEGS
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
Brass Adapter 1/8 NPT Male to 1/4 NPT Male
Threading Adapter, NPT 1/4 Female to NPT 3/8 Male
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
Adapter 7/16-28 (m) to 1/8” NPT (f) – LockNLube
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
Steel Adapter Fitting, 1/8 Inch Male to 1/4 Inch Male NPT
RPS Lighting Female 1/8" Mini to Male 1/4" Mono Adapter RS-8610