3/8 X 1/8 Nipple Bush

The 3/8 X 1/8 Nipple Bush by EARLS is a precision fluid-transfer adapter designed for high-performance automotive cooling and fuel systems. This compact fitting is essential for custom engine builds, cooling system upgrades, and fuel line routing where space is limited and reliable connections are critical. It serves as a vital transition component that both professional builders and weekend enthusiasts rely on for leak-free operation.

This nipple bush features a stepped-bore design that allows for the connection of two different hose or tube diameters—3/8-inch on one end and 1/8-inch on the other—while maintaining full flow integrity under pressure. Weighing just 0.02 lbs and measuring 1.2 inches in length, its compact form factor is ideal for tight engine compartments and restrictive mounting locations. The construction is designed to resist corrosion in cooling and fuel environments while withstanding typical system pressures.

Mechanics and fabricators working on custom water cooling loops, fuel delivery systems, or gauge-line networks will find this nipple bush to be an essential adapter for transitioning between different sizes. Its reliable performance makes it suitable for a variety of automotive applications, ensuring that both enthusiasts and professionals can achieve optimal results in their projects.