#4 90 Deg Twist-Lok Hose End

The #4 90 Deg Twist-Lok Hose End is a precision hydraulic fitting engineered for high-performance automotive fuel and coolant systems. Built by RUSSELL, a trusted name in motorsports plumbing, this 90-degree adapter serves dedicated enthusiasts and professional mechanics who demand leak-free connections under pressure. Whether you're assembling a custom fuel system on a race engine, upgrading cooling lines on a modified street machine, or rebuilding a complex hydraulic circuit, this fitting delivers the reliability required in demanding applications.

Constructed from aluminum and finished in blue anodizing for corrosion resistance, the #4 90 Deg Twist-Lok Hose End accepts a 4 AN hose barb inlet and terminates in a 4 AN female thread output, making integration seamless in standardized AN plumbing systems. The Twist-Lok design—RUSSELL's proprietary clamping mechanism—grips the hose securely without requiring separate clamps, reducing assembly time and eliminating the risk of hose slip during high-vibration or high-temperature operation. The 90-degree geometry allows tight routing around engine bays and frame rails, critical for custom installations where space is limited and line run efficiency matters.

This fitting is ideal for fuel injection conversions, turbo coolant circuits, transmission cooler lines, and custom radiator setups on both carbureted and EFI platforms. Mechanics and fabricators working on LS swaps, small-block builds, or independent cooling loops will find the compact 2.65 x 1.6 x 5.75-inch footprint and lightweight 0.06 lbs design practical for tight underhood layouts. Compatibility with standard 4 AN hose ensures you can source replacement tubing from any reputable automotive supplier, keeping your system maintainable long-term.