The Ford 2011-2014 F-150 SVT Raptor Auto Locking Hub Front Axle Vacuum Line Tubes (part number BL3Z-7A785-B) are designed for the 4x4 and 4WD systems of the F-150 SVT Raptor. These vacuum line tubes are essential for the operation of the integrated wheel ends (IWE), which allow for the automatic engagement and disengagement of the front hubs when switching between 2WD and 4WD. Made from durable materials, these tubes ensure reliable performance under various driving conditions. If you're experiencing issues with your 4WD system or are in need of a replacement, these OEM vacuum line tubes will help maintain the functionality and efficiency of your vehicle's front axle system.