Prepare your semi to be Ready for the Road Ahead™, with the National 370025A Red 37 Series Wheel Seal for TN Spindle Axles that offers superior axle protection and lubricant leakage prevention. By snugly fitting inside the hub assembly, this replacement wheel seal locks in lubricants while preventing contaminants from entering the wheel itself. Created with heat and weather-resistant rubber for optimal performance and durability in severe climates. FleetPride is your First Click in Heavy Duty®.