Dexter Fortress Threaded Aluminum Oil Cap, 10,000 lb HD – 15,000 lbs, K21-301-00 This Fortress aluminum oil cap is designed to fit 10,000-15,000 lb. axles. Whether you are using oil or grease, this cap will help keep your bearings lubed. The Fortress aluminum oil caps are engineered and designed by Dexter as a bona-fide superior bearing protection solution for trailer axles. Increase the life of your trailer, by only using Dexter’s top of the line, durable, quality replacement parts. The large side fill/drain plug allows for easy maintenance of your trailer. Replacement For: Dexter- K71-148-00, 021-036-00, 021-256-00 Valcrum- ST-400D-AM Specifications: Material- Aluminum Axle Capacity- 10,000 lbs. Heavy Duty – 15,000 lbs. Thread Diameter- 4″ Thread Depth- 0.570″ Dexter K21-301-00
