Restore proper 4WD operation with the 2011–2014 Ford F-150 OEM 4WD Vacuum Line Tube Hose Check Valve BL3Z-3A788-A. This genuine Ford vacuum check valve is designed specifically for the 4-wheel drive system in 2011, 2012, 2013, and 2014 F-150 models, helping maintain consistent vacuum pressure to engage and disengage the front hubs. A faulty or leaking vacuum line check valve can lead to 4WD system failure, delayed engagement, or warning lights on the dash. This OEM Ford hose and valve assembly ensures a precise fit, leak-free performance, and long-term durability under demanding conditions. Built to meet factory specifications, this component is essential for reliable F-150 4WD system performance and drivetrain functionality.