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Your search for "oil bath cap" revealed the following:

OC-86580-26-LOTOF2
(2) Replacement 2-7/8" Oil Bath Caps Trailer Axle Fits Dexter 21-35 6K 7K 8K (OC-86580-26-LOTOF2)
$17.52
3.5" Oil Bath Cap Trailer Axle Dexter 9K 10K 8-415 430 After 2009 (21-88-KIT)
3.5" Oil Bath Cap Trailer Axle Dexter 9K 10K 8-415 430 After 2009 (21-88-KIT)
$23.99
2 Pack - Billet Aluminum Oil Bath Dust Caps — 2-7/8"-12 Thread Pair (21-35 BILLET-CHROME-KITX2)
2 Pack - Billet Aluminum Oil Bath Dust Caps — 2-7/8"-12 Thread Pair (21-35 BILLET-CHROME-KITX2)
$99.13 $126.99 Sale
4 Pack Billet Aluminum Oil Bath Caps 2-7/8"-12 — Replaces Dexter 21-35 (21-35 Billet-Chrome-KitX4)
4 Pack Billet Aluminum Oil Bath Caps 2-7/8"-12 — Replaces Dexter 21-35 (21-35 Billet-Chrome-KitX4)
$193.84
Billet Aluminum Machined 2-7/8" Oil Bath Cap (21-35 Billet-Chrome-Kit)
Billet Aluminum Machined 2-7/8" Oil Bath Cap (21-35 Billet-Chrome-Kit)
$51.99
3-3/4" Oil Cap w/ ORing & Plug 10K-16000# Hayes Alko Trailer Axle Bearing Dust 21-219 (K71-859-00)
3-3/4" Oil Cap w/ ORing & Plug 10K-16000# Hayes Alko Trailer Axle Bearing Dust 21-219 (K71-859-00)
$39.99
ONE - Oil Cap Fits 6-8K Axles 2-7/8"-12 threads Includes O Ring and Plug (21-35-KIT)
ONE - Oil Cap Fits 6-8K Axles 2-7/8"-12 threads Includes O Ring and Plug (21-35-KIT)
$8.99
4.0" BILLET ALUMINUM Oil Bath Cap 21-36 Trailer Axle bearing hub 10K-HD 12K-15K (21-36 Billet-KIT)
4.0" BILLET ALUMINUM Oil Bath Cap 21-36 Trailer Axle bearing hub 10K-HD 12K-15K (21-36 Billet-KIT)
$72.96
4 Pack Replacement 8K 2-7/8" Oil Bath Caps Trailer Axle Fits Dexter 21-35 LCI 8000# (OC-86580-26-LOTOF4)
4 Pack Replacement 8K 2-7/8" Oil Bath Caps Trailer Axle Fits Dexter 21-35 LCI 8000# (OC-86580-26-LOTOF4)
$27.21
X2 (TWO) 3.5" Oil Bath Cap Trailer Axle Dexter 9K 10K 8-415 430 After 2009 (21-88-KIT-LOTOF2)
X2 (TWO) 3.5" Oil Bath Cap Trailer Axle Dexter 9K 10K 8-415 430 After 2009 (21-88-KIT-LOTOF2)
$35.99
Pair (2) 2-7/8" Oil Bath Hub Caps – Trailer Axle (21-35) (K71-038-00)
Pair (2) 2-7/8" Oil Bath Hub Caps – Trailer Axle (21-35) (K71-038-00)
$26.27
2-7/8"-12 Billet Aluminum Threaded Oil Cap Kit With O-Ring and Plug — 6K-8K Trailer Axle (21-35 Billet-Kit)
2-7/8"-12 Billet Aluminum Threaded Oil Cap Kit With O-Ring and Plug — 6K-8K Trailer Axle (21-35 Billet-Kit)
$36.95