Update your semi with enhanced axle protection and lubricant leakage prevention, with the National 370003A Red 37 Series Wheel Seal for 38,000 lb-48,000 lb Drive Axles that ensures you're Ready for the Road Ahead™. Due to its ability to tightly fit inside the hub assembly, this replacement wheel seal effectively prevents contaminants from entering the wheel, while locking in lubricant. Molded with weather and heat-resistant rubber for optimal durability and performance in challenging climates. FleetPride is your First Click in Heavy Duty®.