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 3.75" diameter aluminum oil caps designed for 10,000–16,000 lb trailer axle applications. Engineered by Dexter for heavy-duty performance, these caps are built to meet demanding commercial and industrial trailer requirements.
Designed to fit select Dexter, Rockwell, Lippert, and AL-KO axle configurations. Always verify hub bore diameter before installation.
| Component | Quantity |
|---|---|
| Dexter FORTRESS 3.75" Aluminum Oil Caps | 2 |
| Specification | Detail |
|---|---|
| Cap Diameter | 3.75" |
| Material | Aluminum |
| Axle Compatibility | 10,000–16,000 lb |
| Manufacturer | Dexter |
| Individual Part Number | K21-304-00 |
| Brand | Part Numbers |
|---|---|
| Dexter | K71-859-00, K21-226-00, 021-229-00, 021-219-00, 021-12011 |
| Valcrum | ST-375 |
| Rockwell | 12001 |
| AL-KO | 568220, K568220 |
Important: Verify hub bore diameter and axle compatibility before installation.
