Replacement for Oil Cap 21-88 for 9K, 10K, and 12K Oil Bath Trailer Axle Hubs
Updated 04/14/2017 | Published 04/13/2017
Question:
the only numbers i can find on the axle cap is 21-88 and i cant that on line anywhere. was wondering if there is another part # to match this.
asked by: Shandy S
1
Helpful Expert Reply:
You have found it! Oil cap kit # RG04-300 includes the 21-88 oil cap you are looking for. The plug and o-ring are also included.
expert reply by:
Michael H
1
Product Page this Question was Asked From
Replacement Oil Cap Kit for 9,000-lb and 10,000-lb Dexter Axle
- Trailer Bearings Races Seals Caps
- Caps
- Oil Cap
- 3.50 Inch O.D.
- 3.50 Inch
- 9000 lbs Axle
- 10000 lbs Axle
- Redline
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Search Results: blue ox bx7420
- Search Results: blue ox brk2022
- Search Results: wire loom
- Search Results: tjb~2001~b
- Search Results: thule tracker ii
- Search Results: fender back
- Search Results: vault hub
- Video: How to Install the Blue Ox Base Plate Kit - 2026 Ford Bronco
- Shop: Blue Ox Patriot Portable Flat Tow Brake System - Proportional
- Shop: Trailer Wiring
- Shop: Trailer Hub and Drum Assembly - 3,500-lb Axles - 10" Diameter - 6 on 5-1/2 - Pre-Greased
- Shop: Curt TriFlex NEXT Trailer Brake Controller w/ Custom Harness - 1 to 4 Axles - Proportional
- Shop: Curt Venturer NEXT Trailer Brake Controller w/ Custom Harness - Up to 3 Axles - Time Delayed
- Shop: Wire Loom, 1/2" Diameter (per Foot)
- Shop: Replacement Oil Cap Kit for 9,000-lb and 10,000-lb Dexter Axle
- Shop: Replacement Swivel Pin Kit for Trailer Jacks
- Q&A: Replacement Head for Reese Trunnion Bar Weight Distribution System
- Video: Blue Ox Base Plate Kit Complete Installation - 2022 Ford Bronco
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Video: An In-Depth Look at the Roadmaster Battery Charge Line Kit for Towed Vehicles
- Shop: Trailer Hitch
- Article: Trailer Wiring Diagrams
- Q&A: Which is Better Roadmaster or Blue Ox Tow Bar
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: An In-Depth Look at the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit
- Video: Comparing Portable Flat Tow Braking Systems - Curt RVi and Blue Ox Patriot
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: Recommended Bike Rack and Dual Hitch Adapter for Carrying E-Bikes While Flat Towing
- Video: Breaking Down the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit
- Q&A: Replacing 6-Way on Trailer With 7-Way Connector
Explore Expert Info
![Our Expert]()
on Trailer Bearings Races Seals Caps
on Trailer Bearings Races Seals Caps
