XL3Z3A788AA Auto Lock Hub Upper Vacuum Solenoid Line Tube with Check Valve Assembly Fit for Ford F-150 1999-2003, F-150 Heritage 2004, F-250 1999 4WD Actuator Vacuum Line OE# XL3Z-3A788-AA
Precise Compatibility: Fits for 1999–2003 Ford F-150, 2004 Ford F-150 Heritage, and 1999 Ford F-250. Direct replacement for OE# XL3Z-3A788-AA, ensuring a precise vehicle match
Reliable 4WD Function: Maintains correct vacuum pressure for auto hub lock actuators, allowing smooth and consistent engagement of the four-wheel drive system
Built-In Check Valve: Integrated check valve prevents vacuum backflow, protecting the solenoid and hub actuator from damage and improving overall system stability
Durable Construction: Manufactured with high-quality materials to resist heat, vibration, and wear, extending service life under demanding driving conditions
Easy Installation: Direct-fit design plugs into the existing vacuum line system with no modifications required, restoring 4WD performance quickly and effectively