Fortress Aluminum oil Cap K21-305-00

Threaded Design: Features a 4.000" threaded diameter and a 0.570" thread depth, ensuring a secure fit for compatible axles.

Durable Construction: Crafted from cast aluminum with a black coating, providing robust protection against environmental elements.

Enhanced Maintenance: Equipped with a larger, easily accessible side fill/drain plug, facilitating straightforward oil or grease changes.

Reliable Sealing: Includes a resilient rubber O-ring and gasket to ensure airtight sealing, preventing contaminants from entering the bearing area.