#4 to 12mm Adapter Fittings (2pk) Uniflare

The EARLS #4 to 12mm Adapter Fittings (2-pack) Uniflare are essential components for anyone upgrading their fluid line systems, including fuel, oil, coolant, or brake systems. These fittings are particularly useful for those building high-performance engine packages or converting to braided steel line systems.

Manufactured to high standards, EARLS Uniflare fittings feature precision threads and swaged barb sections that ensure leak-free connections under high pressure and temperature cycling. The fittings provide a step-down connection from SAE #4 hose (1/4 inch nominal) to metric M12x1.5 ports, making them ideal for modern engine conversions and modified fuel rails.

Professional mechanics and serious DIY builders rely on these fittings for fuel system retrofits and custom cooling loops where OEM-to-aftermarket port sizes mismatch. Their design creates a mechanical seal that is superior to compression-only fittings, critical for fuel systems operating at 40–60 PSI or higher.