Double-ended Aluminum AN Wrench 4AN Nut - 6AN Nut

The Double-ended Aluminum AN Wrench 4AN Nut - 6AN Nut from REDHORSE PERFORMANCE is purpose-built for technicians and enthusiasts who work with AN-style fittings in fuel systems, oil coolers, and hydraulic brake lines. This dual-size wrench eliminates the need to carry multiple tools when transitioning between 4AN and 6AN components—a common reality in modern engine swaps, turbo installations, and high-flow fuel system upgrades. Whether you're rebuilding a carbureted engine's fuel delivery or assembling a completely custom fuel injection setup, having the correct wrench geometry prevents rounded fasteners and ensures leak-free connections every time.

Constructed from lightweight aluminum, this wrench delivers the strength needed for hand-tight and moderate torque work without adding unnecessary weight to your tool bag. The double-ended design features precision-machined openings that grip AN nuts with zero slippage—critical when working in tight engine bays where access is limited and knuckle clearance matters. The compact 9.4-inch length and 1-inch width profile allow access to fittings nestled against valve covers, intake manifolds, and firewall-mounted components where standard wrenches simply won't fit. Aluminum construction also resists corrosion from fuel additives and hydraulic fluid exposure, maintaining wrench integrity across multiple rebuild cycles.

Serious performance builders and professional mechanics standardize on REDHORSE PERFORMANCE tools for any fuel system or brake line assembly requiring precision and reliability. This wrench is ideal for LS engine conversions, fuel cell installations, dual-carb setups, and any application where AN fittings dominate the plumbing. At 0.24 lbs, it's lightweight enough to keep in your emergency roadside kit without burden, yet robust enough for shop-floor repetitive use. Proper AN wrench technique—applying force straight down the axis of the fitting—combined with the correct wrench size prevents damage and ensures professional-grade results every time you turn a fastener.