Str Bulkhead Fitting #4 Black

The FRAGOLA Straight Bulkhead Fitting #4 Black is a precision aluminum bulkhead connector engineered for high-pressure fluid transfer systems in performance and custom applications. This #4 AN male to #4 AN male straight bulkhead fitting is constructed from aircraft-grade aluminum and finished in black anodized coating, providing corrosion resistance and a professional appearance in fuel systems, hydraulic lines, and cooling circuits where reliability and clean aesthetics are priorities.

The straight bulkhead design allows dual #4 AN ports to pass through panel, firewall, or bulkhead walls without external fittings protruding into adjacent compartments—a critical advantage in tight engine bays and fabrication environments where space and weight efficiency are paramount. The black anodized aluminum construction resists corrosion in saltwater and high-humidity environments common to marine and coastal applications, while remaining lightweight compared to steel alternatives. At 0.03 lbs, this fitting adds negligible weight to a system while maintaining full pressure integrity at standard automotive and small aircraft fluid system pressures.

This bulkhead fitting is ideal for builders, fabricators, and technicians customizing fuel systems, hydraulic brake lines, coolant circuits, and turbo supply systems in performance vehicles, hot rods, classic cars, and light aircraft. FRAGOLA is recognized for quality hose and fitting components trusted in racing and restoration shops where system integrity cannot be compromised. The straight configuration ensures consistent flow and minimal turbulence compared to 90-degree alternatives, supporting applications where smooth hydraulic or fuel delivery is essential to engine performance and reliability.