This oil seal sits at the front axle hub, retaining lubricant inside the final-drive housing while excluding dirt and moisture from the wheel-end bearing cavity. Corteco manufactures the seal to match the original housing bore and shaft journal dimensions, so the lip contacts the shaft at the correct interference and angle. A worn or hardened seal allows gear oil to weep past the lip, which can lead to bearing starvation and eventual hub failure. On installation, inspect the shaft surface for grooves or rust; if present, polish the contact area or fit a wear sleeve before pressing the seal to its seating depth.