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

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

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