Earl's Performance Straight Aluminum AN to Metric Adapter Fittings

Earl's Performance Straight Aluminum AN to Metric Adapter Fittings provide a precision-engineered solution for seamlessly connecting AN (Army-Navy) fluid line systems to metric-threaded ports and components. Whether building a custom performance plumbing system that combines domestic and international hardware, or plumbing a high-output engine equipped with metric-ported components, these straight adapters deliver the clean, leak-free connections that professional builders and serious enthusiasts demand.

Machined from aluminum, these adapters offer an excellent strength-to-weight ratio and are engineered to perform across a broad range of fluid system applications — including fuel, oil, coolant, and brake lines. The straight inline configuration promotes unobstructed flow and clean routing without unnecessary bends or restrictions.

Key Features:

• Precision-machined aluminum construction for optimal strength with minimal weight penalty
• Straight inline design for direct, unrestricted fluid flow
• AN to metric thread compatibility — bridges AN fitting standards with metric-threaded ports and components
• Multiple configurations available to suit a wide range of AN sizes and metric thread applications
• Versatile application range — suitable for fuel, oil, coolant, and brake line systems
• Sold individually — select the exact configuration needed for your build
• Made in the USA by one of motorsport's most trusted plumbing brands

Earl's Performance has been the benchmark in racing fluid systems since founder Earl Fouts established the company in 1955. What began as a supplier of military aircraft surplus plumbing components to the racing industry evolved into the brand that essentially defined the performance aftermarket plumbing industry. Today, Earl's collaborates with top-tier motorsport programs across Formula 1, IndyCar, and beyond — making this line of AN to metric adapter fittings a proven choice wherever precision plumbing is required.