66X6 by Danfoss | Compression Fitting | Female Connector | 3/8 Tube OD x 1/4 Female NPTF | Brass

Applications: * Instrumentation, hydraulic and pneumatic systems., Advantages: * Low cost. * No flaring. * Easy to assemble. * Fair vibration

1880X6 by Danfoss, Quick Connect Air Brake Adapter

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Everbilt 3/8 in. OD Compression x 1/4 in. FIP Brass Adapter Fitting 800879 - The Home Depot

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Hose & Fluid Connectors