Match the part number, measurements and connection points that apply to your trailer.
| Hub Face | Measure hub face to hub face. |
|---|---|
| Spring Center | Measure mounting centers and confirm perch configuration. |
| Capacity | Match the required axle rating. |
| Brakes | Confirm brake type and flange configuration. |
Genuine Dexter FORTRESS 2.875" diameter aluminum oil caps designed for 5,200–8,000 lb trailer axle applications. Built for durability and precise fit, these caps are engineered to meet the performance demands of commercial and heavy-duty trailer use.
Designed to fit select Dexter, Rockwell, Lippert, and AL-KO axle configurations. Always verify hub bore diameter before installation.
| Component | Quantity |
|---|---|
| Dexter FORTRESS 2.875" Aluminum Oil Caps (replaces 21-35) | 2 |
| Specification | Detail |
|---|---|
| Cap Diameter | 2.875" |
| Material | Aluminum |
| Axle Compatibility | 5,200–8,000 lb |
| Manufacturer | Dexter |
| Individual Part Number | K21-303-00 |
| Brand | Part Numbers |
|---|---|
| Dexter | K71-038-00, 021-035-00, 21-35, K21-297-00, 021-8001 |
| Valcrum | ST-2875 |
| Rockwell | 8001 |
| Lippert | 695815 |
Important: Verify hub bore diameter and axle compatibility before installation.
