#4 AN Plug

The #4 AN Plug from FRAGOLA is a hex head aluminum fitting designed for high-performance fuel, oil, and coolant line systems in modified vehicles and racing applications. This compact port closure is essential for building custom fluid distribution layouts, reconfiguring engine bays, or sealing unused AN ports during engine swaps and turbocharger installations.

Constructed from aluminum with a precision-machined hex head design, the #4 AN Plug provides a secure, vibration-resistant seal that can withstand the pressures of modern EFI fuel systems and forced-induction setups. Its compact design allows for easy installation in tight engine compartments, ensuring a clean and leak-free solution without compromising system integrity.

Mechanics and fabricators rely on FRAGOLA #4 AN Plugs when retrofitting fuel rails, sealing manifold ports, or terminating secondary cooling circuits in turbo and supercharger builds. This fitting pairs seamlessly with any #4 AN port, making it a versatile choice for both street enthusiasts and professional track builders.