Bulkhead -6an w5/16in Nipple

The Bulkhead -6AN with 5/16 inch Nipple by ATL Fuel Cells is a precision-engineered fuel system component designed for serious performance builders and race fuel cell installations. This adapter serves as a critical interface point in custom fuel delivery systems, allowing you to transition between different line sizes and connection types without compromising flow integrity or system pressure rating. Whether you're building a dedicated race car fuel system, upgrading a dedicated fuel cell setup, or integrating a high-capacity fuel tank into a modified street car, this bulkhead fitting provides the reliability and compatibility that professional shops and experienced mechanics demand.

This bulkhead adapter features a -6AN (AN6) connection on one end, which corresponds to 3/8-inch tubing and handles high-pressure fuel delivery applications up to fuel pump system specifications. The 5/16-inch nipple on the opposite end provides a secondary connection point for return lines, breather lines, or auxiliary fuel system plumbing. ATL Fuel Cells manufactures this fitting to OEM aerospace and motorsports standards, ensuring that the material composition, thread pitch, and seal surfaces meet stringent pressure and compatibility requirements. The compact 2 x 1 x 4-inch footprint and lightweight design (0.06 lbs) make it ideal for tight engine bay installations where space optimization is critical to overall build aesthetics and functionality.

This component is essential for builders integrating ATL fuel cells or equivalent aftermarket fuel tanks into modified vehicles, particularly in motorsports applications, vintage hot rods, and high-performance street cars. The -6AN standard ensures compatibility with AN-certified fuel line, fittings, and adapter networks widely available through performance automotive suppliers. Installation requires basic mechanical knowledge of fuel system assembly—ensure all connections are torqued to specification and sealed properly to prevent fuel leakage. The bulkhead nipple design allows for flexible plumbing arrangements, making it valuable when retrofitting fuel systems into vehicles with non-standard tank locations or complex fuel delivery layouts.