【Compatible With】1998 - 2004 Ford F-250 F-350 F-450 F-550 4X4s having the vacuum-operated front axle,Same as OTC 6695
【High Quality】Integral steel construction with black oxide finish resisting rust and impact, provides much longer service life.
【Easy to Install】Install the half-shaft seal onto the half-shaft, and then correctly insert the half-shaft into the wheel hub knuckle assembly, making the replacement of the wheel vacuum seal simpler, faster and more accurate.
【Function】Prevents front hub vacuum leaks that would cause the 4WD to not engage and covers in oil to prevent corrosion.