Hose Fitting #4 Straight Push Lock Black

The Hose Fitting #4 Straight Push Lock Black from FRAGOLA is a precision engineered adapter designed for high-performance fuel, coolant, and brake system applications where reliable, leak-free connections are non-negotiable. Built for automotive enthusiasts and professional mechanics undertaking custom fuel injection retrofits, turbo system installations, or hydraulic brake conversions, this 4 AN straight push-lock fitting eliminates the complexity of traditional barbed fittings while delivering superior security. Whether you're building a high-horsepower street machine or restoring a classic with modern fuel management, this fitting provides the quick-connect reliability that separates amateur work from professional-grade results.

The Hose Fitting #4 Straight Push Lock Black features a straight-flow design with a 4 AN hose barb mating to a 4 AN female port, constructed from lightweight yet durable aluminum with black anodized finish for corrosion resistance and a clean aesthetic under the hood. The push-lock mechanism (8000 Series Push-Lite design) allows one-handed connection and disconnection without crimping tools or specialized equipment—a game-changer when space is tight around an engine bay or during diagnostic work. The straight configuration ensures minimal flow restriction, critical for fuel delivery systems where pressure drop can affect fuel trim and idle quality, while the black anodized coating resists oxidation in high-temperature underhood environments and maintains appearance through years of service.

This fitting excels in custom fuel system builds, turbocharger inlet/outlet plumbing, auxiliary coolant loop circuits, and brake pressure line upgrades where vibration resistance and ease of service are paramount. Its compact dimensions (1.3 x 1.15 x 4.1 inches) allow installation in confined engine bays without interference with intake manifolds or accessory brackets. Compatible with any 4 AN hose specification and female AN ports, it integrates seamlessly into modular fuel rails, remote oil filtration systems, and custom cooling solutions—the lightweight aluminum construction (0.03 lbs) adds negligible mass while maintaining the structural integrity required for fuel pressures up to 250 psi under normal operating conditions.