Pair of 4.0" Billet Aluminum Oil Bath Caps – 12 Thread
Replaces Dexter 21-36
Part Number: 21-36 Billet-KitX2
Heavy-duty billet aluminum oil bath caps designed to replace standard 4.0" threaded plastic oil caps commonly used on select Dexter oil bath hub assemblies. Precision machined from solid billet aluminum for durability, corrosion resistance, and long service life. Ideal upgrade solution for cracked, leaking, or damaged clear plastic caps.
Features
- Machined from solid billet aluminum
- 4.0" diameter with 12-thread design
- Replaces Dexter 21-36 oil caps
- Includes new O-rings and rubber plugs
- Designed specifically for oil bath hub applications
- Durable alternative to plastic sight caps
Specifications
| Cap Diameter | 4.0" |
| Thread Count | 12 Threads |
| Material | Billet Aluminum |
| Application | Oil Bath Hub |
| Replacement Reference | Dexter 21-36 |
| Quantity Included | 2 Complete Caps |
Compatible Drum Casting Numbers
| Casting Number | Application |
| 9-44 | Oil Bath Hub |
| 9-27 | Oil Bath Hub |
| 9-28 | Oil Bath Hub |
This Listing Contains
- 2x Billet Oil Caps (21-36 Style)
- 2x O-Rings (010-050-00)
- 2x Rubber Plugs (046-032-00)
This cap will not fit certain 10K (2009 and newer) general duty Dexter axles. Verify cap diameter, thread count, and hub casting number before ordering.