#4 Flare End Bulkhead Union Black

The #4 Flare End Bulkhead Union Black is a precision hydraulic and pneumatic fitting designed for reliable fluid transfer between two AN4 (quarter-inch) male connections through a panel or bulkhead wall. This component is essential for custom fluid system builds, aerospace applications, and high-pressure industrial setups where space constraints and vibration resistance are critical.

Constructed from black anodized aluminum, this bulkhead union offers durability and chemical resistance in fuel, oil, and coolant systems operating at elevated pressures. The flare-end design features a 37-degree cone angle, creating a mechanical seal that ensures leak-free performance under thermal cycling and vibration. Its straight-through geometry allows for unobstructed fluid flow, making it ideal for retrofit installations and OEM applications.

Aircraft builders, motorsports fabricators, and industrial hydraulic technicians will find this fitting invaluable for its compact design and reliable performance. With a weight of 0.05 lbs and dimensions of 2.3 x 1.1 x 3.75 inches, it integrates seamlessly into tight-package system layouts without compromising structural integrity.