JB U2-6 3/8" SAE Flare to Flare Union

The JB Industries U2-6 is a professional-grade 3/8" SAE flare to flare union precision-machined in the USA from high-tensile C360 brass. Designed for the rigorous demands of HVACR service, this fitting features a 65% copper and 35% zinc composition, providing superior corrosion resistance and structural integrity compared to lower-quality imports. It is engineered to create a secure, metal-to-metal seal between two 3/8" OD tubing lines, supporting vacuum pressures up to 5,000 psi depending on the application and tube material. Whether you are working with refrigeration line sets, hydraulic systems, or marine applications, the U2-6 flare connector ensures a reliable "make and break" joint that withstands high-vibration environments. This SAE J513 compliant fitting is compatible with copper, brass, aluminum, and steel tubing, making it a versatile staple for any technician's truck. Its heavy-duty forging eliminates the risk of seasonal cracking common in thinner, cast alternatives, ensuring long-term performance in high-pressure R-410A or R-22 systems.

• Premium American-Made Brass: Machined from heavy-duty C360 brass for maximum tensile strength and resistance to stress corrosion cracking.
• High-Pressure Rated: Capable of handling vacuum and pressures up to 5,000 psi, making it ideal for modern high-pressure refrigerants.
• Universal Compatibility: Works seamlessly with copper, brass, aluminum, steel, and even compatible plastic tubing where an acceptable flare can be generated.
• Vibration Resistance: Engineered for "make and break" assembly with a robust hex design that allows for proper torque application.
• Industry Standards: Manufactured to strictly conform with SAE J513, ASA, and AHRI requirements for refrigeration service.

Yes. The JB U2-6 is rated for pressures up to 5,000 psi, which far exceeds the operating pressures of standard R-410A residential and commercial systems.

No. Standard flare connections rely on the mechanical seal between the flares, not the threads. Using tape or sealant can lead to leaks. A drop of refrigerant oil or Nylog on the back of the flare is recommended to ensure proper torque without binding.

Absolutely. As long as a proper 45-degree flare can be formed on the tubing, the 3/8" flare union will provide a leak-tight connection for copper-to-copper, copper-to-aluminum, or even steel tubing.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.