4AN to 4AN Flare Union AN/AN

The REDHORSE PERFORMANCE 4AN to 4AN Flare Union AN/AN (model 815-04-2) is a straight-through adapter fitting designed to connect two 4 AN male ports in high-pressure fluid systems. Constructed from lightweight aluminum with black anodized finish, this compact coupling maintains the integrity of AN-spec plumbing while eliminating the need for separate hose segments. The flare union design ensures a secure, leak-free seal critical in fuel, oil, coolant, and brake applications where reliability cannot be compromised.

At 0.06 lbs and measuring 2.8 x 1.05 x 3.8 inches, this fitting occupies minimal space in tight engine bays and component layouts. The aluminum construction reduces system weight compared to steel alternatives while maintaining sufficient strength for AN system pressures. Black anodize provides corrosion resistance and a professional appearance in both street and track applications. The 4 AN port size (1/4-inch nominal) represents the standard mid-range flow capacity, suitable for moderate to high-volume fluid transfer in performance and off-road vehicles, marine engines, and custom hydraulic systems.

This adapter is essential for builders and technicians routing hose runs where direct port-to-port connection is required without intermediate hose assemblies. Common applications include fuel system plumbing, oil cooling lines, transmission cooler circuits, and brake system reconfiguration. The 815-04-2 serves as both a replacement component for existing systems and a core element in custom fabrication projects where AN-certified connections are mandatory. Buyers should verify their system's pressure rating and hose diameter compatibility before installation.