This straight adapter is a highly useful conversion fitting for custom-built automotive and marine fuel systems where classic metric connections need to be safely adapted to the popular and universally standardized AN plumbing system. The fitting is precision-machined from solid brass to ensure the best possible thread seal and excellent long-term resistance against various aggressive fuels, including ethanol blends.

Technical specifications:

• Material: Solid Brass
• Thread Side A: Metric M10 x 1.0 (10x1)
• Thread Side B: AN6 (Which perfectly shares the exact same thread pitch and physical dimensions as a 9/16" UNF thread)

Information regarding the AN system: The acronym AN originally stands for Army/Navy, a historic US military specification that has now become the universal, trusted industry standard in global motorsport plumbing. Because AN6 and 9/16" UNF share the exact same thread profile, this particular fitting is incredibly versatile when converting components like older European mechanical fuel pumps, filter housings, or carburetors featuring an internal M10 thread to a modern, high-pressure AN fuel line system.