Outfit your semi to be Ready for the Road Ahead™ with enhanced axle protection and lubricant leakage prevention, with the National 370022A Red 37 Series Wheel Seal. Thanks to a snug design that fits inside the hub assembly, this replacement wheel seal prevents contaminants from entering the wheel, while locking in the lubricant. Crafted with heat and weather-resistant rubber for optimal performance and durability in rugged climates FleetPride is your First Click in Heavy Duty®.