JB U2-4 1/4" SAE Flare to Flare Union

When you're out in the field, you need refrigeration fittings that won't lead to a callback. The JB Industries U2-4 is a heavy-duty 1/4" SAE flare to flare union machined from high-grade brass to meet strict AHRI and SAE J513 standards. Unlike cheap imports that use porous, low-copper brass, this brass flare union is forged to eliminate cracks and ensure a long-lasting, leak-free connection under high-pressure conditions up to 3000 PSI. Whether you are working with HVAC copper tubing, aluminum, or steel, the 1/4 inch flare connector provides a reliable metal-to-metal seal that handles the rigors of R-410A and other modern refrigerants. The design features generous counter-bores and long dryseal pipe threads, providing maximum clearance for tightening flare nuts and reducing the risk of thinning out the flare in extreme applications. For any veteran tech, the JB U2-4 is the standard for maintaining system integrity in ductless mini-split installations and commercial refrigeration service.

• High-Pressure Reliability: Rated for up to 3000 PSI, making it suitable for high-pressure ACR applications including R-410A systems.
• Superior Material Grade: Machined from premium C360 and C370 brass for high tensile strength and maximum corrosion resistance.
• Universal Compatibility: Engineered for use with copper, brass, aluminum, steel, and even compatible plastic tubing.
• Precision Sealing: Conforms to SAE, ASA, and AHRI standards to ensure a perfect 45-degree mating surface with a 1/4 SAE flare.
• American Made: Proudly manufactured in the USA, ensuring consistent quality and tighter tolerances than most import fittings.

Is the JB U2-4 compatible with R-410A systems?
Yes. This fitting is designed for high-pressure refrigeration service and comfortably handles the operating pressures associated with R-410A and modern synthetic oils.

Should I use thread sealant or Teflon tape on these flare threads?
No. A 1/4" flare union creates a mechanical seal by compressing the copper flare against the brass cone. Using tape or sealant on the threads can interfere with proper torque and actually lead to leaks.

Can this be used on suction lines for mini-splits?
This specific union is a 1/4" SAE size, typically used for liquid lines or pilot lines. Always verify your line-set outer diameter before installation.

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.