12an Fitting - Black

The MEZIERE 12 AN Fitting in Black (WP16012S) is a precision hydraulic adapter designed to connect 12 AN male ports to 16 AN male O-ring interfaces. This straight-configuration fitting is engineered for high-flow cooling systems, fuel distribution networks, and custom pressure line applications where reliable, leak-free connections are critical. Built from aluminum and finished in black anodize, the fitting combines lightweight construction with corrosion resistance suitable for underhood and high-vibration environments.

The straight design minimizes flow turbulence and pressure loss compared to 90-degree or 45-degree adapters, making it ideal for applications where direct-path routing is possible. The O-ring seal on the 16 AN side meets SAE J518 ORB (O-Ring Boss) standards, ensuring consistent, vibration-resistant sealing across thermal cycles. The 12 AN male thread side accepts standard 12 AN quick-disconnect fittings or hard-line tubing, offering compatibility with both modular and permanent system configurations. Weighing just 0.16 lbs, the adapter adds negligible weight while delivering the strength required for pressurized applications up to typical motorsport and industrial system specifications.

This fitting serves track-day racers, custom fabricators, and system builders who need to upsize or adapt existing hydraulic or fluid distribution lines. It is commonly used in engine bay cooling loops, fuel system modifications, and pressurized fluid transfer where the 12 AN to 16 AN step-up preserves flow capacity while simplifying connection geometry. The black anodized finish resists oxidation and blends seamlessly into modern engine bay aesthetics.

MEZIERE is recognized for precision cooling and fluid-management components in the performance automotive market. This adapter is sold individually and is compatible with any system using SAE J518 ORB ports and standard 12 AN male threading, making it a practical addition to custom or replacement cooling and fuel system builds.