✓ VERIFIED
Jan 16, 2020
Almost identical to OEM. Good fit. I did miss that they are sold as each and not as a pair. Small detail and my fault but it did slow my project down a bit.
COMETIC
SKU: 68-10212
Cometic Transmission Drain Plug O-Ring 10-Pack - Harley Milwaukee-Eight
$11.31
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About Cometic
Cometic Gasket manufactures multi-layer steel head gaskets and complete gasket kits in Concord, Ohio. On a built V-twin running higher compression or a big-bore kit, the MLS head gasket is what keeps the top end sealed — which is why Cometic is the default spec on so many engine builds.
Keep your Milwaukee-Eight transmission sealed tight with this Cometic O-ring gasket plug, available in a convenient 10-pack. Engineered as a direct replacement for the Harley OEM part, these O-rings are designed to prevent leaks at the transmission drain plug, even under the demands of a performance V-twin.
Why riders pick this
- Seals transmission drain plug against leaks
- Direct OEM replacement for Harley part #11900092
- 10-pack for multiple services or shop use
- Designed for Milwaukee-Eight V-twin transmissions
A leaky transmission drain plug is a quick way to make a mess and potentially lose vital fluid. This Cometic O-ring provides a robust, OEM-spec seal for your Milwaukee-Eight transmission drain plug, ensuring everything stays where it should. The 10-pack is perfect for riders who perform their own maintenance regularly or for shops that need a ready supply of reliable seals for various bikes.
Secure Your Transmission Fluid
- Engineered to seal the transmission drain plug against leaks
- Direct OEM replacement for Harley part #11900092
- 10-pack provides spares for future service or multiple bikes
- Specifically designed for Milwaukee-Eight V-twin engines
Preventative Maintenance for Your Drivetrain
Routine fluid changes are crucial for the longevity of your Harley's transmission, and each time that drain plug comes out, a fresh O-ring is recommended. This Cometic 10-pack ensures you're always prepared. Don't risk a fluid leak from a worn-out seal; upgrade to a reliable Cometic O-ring to keep your Milwaukee-Eight drivetrain performing flawlessly.
Specifications
- Brand: Cometic
- Manufacturer Part #: C10212
- OE Reference: 11900092
- Length: 7 in
- Width: 6 in
- Height: 0.25 in
- Weight: 0.05 lbs
Common questions
What Harley models use this O-ring?
This O-ring is a direct replacement for Harley OEM part #11900092, which is used on Milwaukee-Eight V-twin engines. Confirm fitment with your bike's parts manual.
Why should I buy a 10-pack?
The 10-pack is ideal for professional shops, riders with multiple Milwaukee-Eight bikes, or those who want to stock up on spares for regular maintenance intervals.
Will this work on Twin Cam engines?
No, this O-ring is specifically designed for Milwaukee-Eight (M8) engines and will not fit Twin Cam models.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Cometic |
| TYPE | Gaskets/Seals |
| SKU | 68-10212 |
| WEIGHT | 0.05 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.87
15 RATINGS
5★
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✓ VERIFIED
Oct 18, 2021
Great seals and gaskets do the job once when you use quality gaskets
✓ VERIFIED
Sep 26, 2019
Seal good and I haven't had any issues..
✓ VERIFIED
Jun 27, 2025
It worked like it was suppose to, delivery was quick. <br />Pleased.
✓ VERIFIED
Dec 19, 2023
Just what I needed
Needed these when changing out intake manifold. They worked perfect for my ‘03 sporty.
✓ VERIFIED
Jun 12, 2023
Cometic from here on out
These seals are the only ones I'll use. others came close but, for me, these are best.
