1/4 x 3/8 Pipe Reducer Bushing

The 1/4 x 3/8 pipe reducer bushing from FRAGOLA is an essential fitting for automotive fuel, coolant, and brake line systems where tube diameter transitions are necessary. This aluminum adapter bridges the gap between 1/4 inch NPT female and 3/8 inch NPT male connections, making it indispensable for custom engine builds, fuel system modifications, and hydraulic brake upgrades. Whether you're fabricating a custom fuel rail, integrating aftermarket cooling components, or adapting OEM lines to performance equipment, this reducer bushing ensures leak-free transitions across mismatched line sizes.

Machined from high-grade aluminum and finished with a vibrant blue anodized coating, this fitting delivers both durability and corrosion resistance in underhood environments. The blue anodize not only protects against oxidation and fluid contamination but also provides visual identification during system diagnostics and maintenance. NPT (National Pipe Thread) tapered connections on both ends create a mechanical seal that tightens under pressure, eliminating the need for secondary sealants and reducing installation labor. The compact 1.65-inch length and lightweight 0.05-pound design make it ideal for tight engine bays and custom manifold work where space is premium.

Mechanics and fabricators favor FRAGOLA reducers for fuel system restorations, high-performance LS swaps, and street rod builds where factory connectors don't align with modern performance components. This fitting accommodates both hard-line and soft-hose adapters, offering flexibility for systems using braided stainless or rubber tubing. Installation is straightforward—hand-thread onto the female port, then wrench-tighten to specification without over-torquing, which can crack the aluminum body. Compatible with gasoline, diesel, water, and brake fluid applications, this reducer bushing is a critical stock item for any serious automotive builder's toolkit.