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Amazon.com: Cable Matters 5-Pack 1/4 to 1/8 Headphone Adapter (3.5mm to 1/4 Adapter, 6.35mm to 3.5mm Adapter) : Everything Else
LTWFITTING 1/4 in. Flare x 1/8 in. MIP Brass Adapter Fitting (5-Pack) HF484205 - The Home Depot
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Barbed to Male 1/4"-28 Adapter for 1/16" or 1/8" ID Soft-walled Tubing– Darwin Microfluidics
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1/8" Male NPT x 1/4" Flare (SAE) Brass Adapter
1/8" 1/4" 3/8" 1/2" NPT Female To Male BSP Brass Pipe Fitting Connector Adapter For Pressure Gauge Air Gas Fuel Water|Pipe Fittings| - AliExpress