Koul Tool Kit 10AN

The ALLSTAR PERFORMANCE Koul Tool Kit 10AN is a specialized hose assembly tool designed for working with AN (Army-Navy) 10 fittings in fuel systems, coolant lines, and hydraulic applications. This compact tool enables precise disassembly and assembly of 10AN hose fittings without risk of damage to seals or ferrules—critical when working on high-pressure or fuel-sensitive systems where leaks create safety and performance issues.

The Koul Tool kit eliminates the need for improvised methods or heavy wrenches that can strip or deform AN fittings. Its purpose-built design grips the hose and fitting body independently, distributing load evenly across the connection. This approach preserves the integrity of reusable fittings and ensures leak-free reassembly—essential for high-performance engines, racing fuel systems, and custom hydraulic setups where fitting failure creates downtime and expense. The 10AN specification covers hose with an inner diameter of 5/8 inch, the size commonly found on fuel distribution lines, fuel injection rails, and return lines on larger displacement or turbocharged engines.

This tool is built for builders, technicians, and engine builders who service fuel systems, cooling loops, or hydraulic assemblies. Whether you're swapping fuel injectors, replacing hoses after an engine rebuild, or diagnosing leaks in a custom fuel system, the Koul Tool 10AN eliminates guesswork and protects investments in hard-to-reach or expensive fittings. Its lightweight, portable design (0.18 lbs) makes it easy to keep in your toolbox or mobile service kit.

ALLSTAR PERFORMANCE is recognized in the automotive aftermarket for producing focused, single-purpose tools that address real friction points in engine building and fuel system work. The Koul Tool line is trusted by shops and enthusiasts because it solves a specific problem without unnecessary complexity, delivering reliable results on repeated use.