This is the Stemco 320-2041 or 3202041 Grit Guard seal. At the wheel end a seal has to hold lubricant in and keep contamination out of the hub, and a Grit Guard seal is the style this listing covers. Pro Gear and Transmission sells it as a genuine Stemco part, along with other seals and gaskets for the hub.
Features
Stemco part number 320-2041
Grit Guard wheel seal
Wheel end part
Genuine Stemco part