EAS15100 Tube seal installs in the outer tube at the C on front axles. Prevents water, sand and other debre from entering the axle tube and damaging the inner seal at the differential causing leakage. EAS15100 fits axle tubes with an inner diameter of 2.5" to 2.75" and axle shafts 1.30" to 1.40" 28 to 35 spline axles.