Endura Adapter Fitting - 3/8 NPT to #6

The Endura Adapter Fitting - 3/8 NPT to #6 from RUSSELL is an essential transition piece for hydraulic and fuel system builds where port sizing mismatches demand a reliable bridge. Whether you're fabricating a custom fuel delivery setup, integrating aftermarket gauges, or adapting OEM components to a modified engine bay, this fitting solves the real-world challenge of connecting dissimilar thread standards without compromising flow or integrity. Built by a manufacturer with decades of automotive hydraulic expertise, this adapter ensures your system pressurizes and performs without leak-prone workarounds.

Engineered with precision-machined brass construction, the Endura fitting converts a 3/8-inch NPT (National Pipe Thread) male port into a -6 AN (JIC) female connection—a standard pairing in performance fuel systems and hydraulic applications where AN fittings offer superior pressure ratings and reusable design. The NPT male thread delivers a tapered-pipe seal that requires no additional sealant when torqued to specification, while the -6 AN female port accepts standard -6 hose ends and adapters rated for continuous pressures well beyond street fuel injection demands. Its compact 2.7-inch length and 0.08-pound weight integrate cleanly into tight engine compartment layouts without adding bulk.

This adapter is indispensable for engine swaps where manifold or block ports don't align with your fuel rail or gauge sender thread pattern, and for tuners upgrading fuel delivery systems on LS, Coyote, and small-block platforms. Install it directly into any 3/8 NPT port on fuel blocks, distribution blocks, or pressure regulators, then attach your -6 AN hose without further modification. RUSSELL fittings meet automotive OEM standards for pressure cycling and vibration resistance, making this a one-time install that won't loosen or weep under the thermal and mechanical stress of daily driving or track duty.