6AN to 4AN(1/4)NPT Union Adapter 90

The 6AN to 4AN (1/4) NPT union adapter 90 by Redhorse Performance is a vital hydraulic line fitting designed for custom fuel, coolant, and brake system plumbing in modified vehicles. This 90-degree adapter connects -6 AN hose to a 1/4-inch NPT port, making it essential for engine bay routing where space is limited and directional changes are necessary.

Constructed from precision aluminum, this adapter features Teflon-lined threads to prevent AN corrosion and ensure leak-free seals under pressure and thermal cycling. The 90-degree elbow design allows for efficient routing of -6 AN hose, which typically has a 3/8-inch inner diameter, to standard NPT-threaded components like oil coolers and fuel pressure regulators without causing pressure drops.

Serious fabricators and performance builders trust this adapter for applications involving forced induction, custom water cooling loops, and standalone fuel systems. Its compact size and lightweight design help minimize fitment issues in tight engine compartments while maintaining full flow capacity for high-demand systems.