Ensure your semi is Ready for the Road Ahead™ with enhanced lubricant prevention and axle protection, with the National 370065A Red 37 Series Wheel Seal for Pro-Par Trailer. 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®.