At a Glance
- >Direct replacement for 21-88 oil cap O-ring
- >Fits 10K General Duty axles (post-2009)
- >Helps maintain proper seal for oil bath hub assemblies
- >Durable rubber construction
- Brand: Dexter
- SKU: 010-163-00
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. |

Part Number: 010-163-00
Replacement O-ring designed to fit the 21-88 style oil cap used on 10,000 lb General Duty (10K GD) axles manufactured after 2009. This seal sits between the oil cap and hub body to help maintain proper oil bath hub sealing and prevent leakage.
| Specification | Detail |
|---|---|
| Outer Diameter | 3.50" |
| Fits Oil Cap | 21-88 (021-88-00) |
| Axle Rating | 10,000 lb GD (After 2009) |
| Material | Rubber O-Ring |
Always verify your existing O-ring size and oil cap model before ordering, as 10K axle hub components can vary by production year and manufacturer.
Selected from R&P customer feedback for Trailer Axle / Running Gear products and related trailer service.
“Got me the axle I needed right away with custom spring perch setting.”
“Had a trailer made to my needs.ken was able to get it done and at a price that was very acceptable.i have bought parts there for 2 other trailers and always in stock”
“Quality work. Staff is polite. Great job welding a project for me. Didn't even want to charge me, so I bought them a case of Corona. They were ecstatic. I ever need a welding or like that R&P Carriages is #1 !!!!!”
Need help matching a part? Send us photos, part numbers and measurements. We can help narrow it down before you order.