Automotive Plumbing Solutions Male To Male Reducer Union Adaptor - 6 To -4 JIC Thread

These male to male adaptors from Automotive Plumbing Solutions feature unequal AN (JIC) threads id...

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Demon TweeksAutomotive Plumbing Solutions Male To Male JIC Equal Thread - 6 JIC (9/16x18), Silver, Plated Steel, Silver
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eBayAPS 9/16 JIC x 9/16 JIC Male To Male Steel Oil Water Brake Fuel Hose Fitting
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Product Information

Full details

Designed for automotive enthusiasts and professional mechanics, this Automotive Plumbing Solutions reducer union adaptor is the ideal tool for transitioning between different AN/JIC hose sizes in high-performance fuel, oil, or cooling systems. Crafted from durable, corrosion-resistant plated steel, it provides a secure, leak-proof connection for modified vehicle plumbing; however, users must verify their specific thread pitch requirements, as it is strictly designed for -6 (9/16x18) to -4 (7/16x20) JIC applications.

All features

Model Part Number01203
BrandAutomotive Plumbing Solutions

Extended Product Information

FAQs

What does JIC stand for?

JIC stands for Joint Industry Council, referring to the 37-degree flare angle connection standard commonly used in hydraulic and automotive plumbing.

Can I use this for brake lines?

No, this fitting is intended for fluid systems like oil, fuel, or coolant, and is not certified for high-pressure automotive braking systems.

Is this adaptor compatible with NPT threads?

No, JIC threads are straight threads and will not seal against tapered NPT threads.

Do I need to use thread sealant or Teflon tape?

No, JIC fittings rely on a metal-to-metal 37-degree flare seal; thread tape is not recommended and can interfere with the proper seating of the fitting.

What is the material finish?

The fitting is made of steel and features a silver-colored plated finish for enhanced resistance to rust and corrosion.

Troubleshooting

Fitting will not thread onto the hose end

Verify that the hose end is indeed a -6 or -4 JIC 37-degree flare; do not force it if the thread pitch does not match.

Connection is leaking fluid

Ensure the 37-degree flare seat is perfectly clean and tighten the fitting slightly further; if it continues to leak, inspect the flare surface for nicks or damage.

Pros and Cons

Pros

  • High-strength steel construction for long-term durability
  • Silver plating provides excellent corrosion resistance
  • Precisely machined threads ensure a leak-free connection
  • Compact size facilitates installation in tight spaces

Cons

  • Not compatible with NPT or metric thread types
  • Requires proper torque to prevent overtightening damage
  • Limited to a specific size reduction (-6 to -4)

Setup, Compatibility & Care

To install, ensure the mating surfaces of your hoses or fittings are clean and free of debris. Always use an appropriately sized wrench to tighten the fitting, taking care to avoid stripping the threads. While the plated finish is rust-resistant, you should avoid using aggressive chemical cleaners that might strip the coating. This fitting is compatible with standard JIC hoses and should be inspected periodically for signs of weeping or movement during routine vehicle maintenance. Always ensure your system is depressurized before attempting to install or remove the adaptor.

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