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Your search for "oil seal" revealed the following:

4 - O-RING, 3.734 I.D. X .139 FOR DEXTER Oil Caps 021-036-00 & 021-037-00 21-36 21-37 (010-050-00-LOTOF4)
4 - O-RING, 3.734 I.D. X .139 FOR DEXTER Oil Caps 021-036-00 & 021-037-00 21-36 21-37 (010-050-00-LOTOF4)
$5.99
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
X4(FOUR) 3.5" Oil Bath Cap Trailer Axle Dexter 9K 10K 8-415 430 After 2009 (21-88-KIT-LOTOF4)
X4(FOUR) 3.5" Oil Bath Cap Trailer Axle Dexter 9K 10K 8-415 430 After 2009 (21-88-KIT-LOTOF4)
$56.89
O-RING, 2.609 I.D. X .139 For Oil Caps 021-035-00 & 021-022-00 (010-045-00)
O-RING, 2.609 I.D. X .139 For Oil Caps 021-035-00 & 021-022-00 (010-045-00)
$4.99
10k GD Hub Drum kit with bearings seals and oil cap, fits Dexter (RP8-430-05-KIT)
10k GD Hub Drum kit with bearings seals and oil cap, fits Dexter (RP8-430-05-KIT)
$344.73
Pair Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug-LOTOF2)
Pair Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug-LOTOF2)
$2.99
21-35 Billet-KIT
2-7/8" BILLET ALUMINUM Oil Cap Fit Dexter 21-35 Trailer Axle Bearing Hub 6K-8K (21-35 Billet-KIT)
$36.95
Triple Lip Trailer Grease Seal 2.25 inch ID x 3.37 inch OD 5.2K to 7K Axles (TD11086)
Triple Lip Trailer Grease Seal 2.25 inch ID x 3.37 inch OD 5.2K to 7K Axles (TD11086)
$8.59
Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug)
Oil plug Center plug for hole in center of oil cap Replaces Dexter 046-032-00 Plug Fits 21-35 21-36 21-88 Caps(OC-Rubber Plug)
$1.51
OIL CAP 8K ALKO THREADED CLEAR 2 7/8 -8 UNA-2A kit (K71-845-00)
OIL CAP 8K ALKO THREADED CLEAR 2 7/8 -8 UNA-2A kit (K71-845-00)
$38.42
Bearing Kit for 9k-10k GD Axles W/ 21-88 OIL CAP After 2009 (BK4-287-GD+21-88CAP)
Bearing Kit for 9k-10k GD Axles W/ 21-88 OIL CAP After 2009 (BK4-287-GD+21-88CAP)
$46.82
Hybrid 8K Trailer Hub Drum Service Kit – 8 on 6.5 – 9/16" Studs – Bearings, Seal & Oil Cap (99-865-916HD-G-KIT)
Hybrid 8K Trailer Hub Drum Service Kit – 8 on 6.5 – 9/16" Studs – Bearings, Seal & Oil Cap (99-865-916HD-G-KIT)
$145.46