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F50109
18-2430
20259
28634
28634A1
79953
79953A2
79953Q04
79953Q2
8M0204693
816610A1
816610A2
830749
F8077
F8186
0311598
0777517
12-19183
18-2945
18-2945
19183
19183B
19183K02
19183Q02
191832
191833
20260
20260B
307552
311598
31170
3852105
500383
6508572
777517
8M0187157
9-60101
F50109
18-2244
20259
22420
28634
28634A1
79953
79953A2
79953K04
79953Q04
79953Q2
79953T2
816610A1
816610A2
9-72650
14834A1
18-2375
21731
67892
67892A05
67892A06
67892A1
8M0058389
9-72651
828816
805726
9-76559
955983
830749
9-60105
4-300hp
2 & 4 Stroke
Mercury 225EFI
Mariner 5-40
F3921989
F4079550
F724150
YSC-10231-40-0C
YSG-14090-90-8G
18-4698
18-46981-9
34502
38015
49955
604-45342-00-00
60721
8M0077608
804612
81987
81987M
883921
9-60100
90430-08003-00
90430-08020-00
90430-08801-00
OEM Mercury Gearcase Drain Plug Seal Washer
Mercury Drain Plug Seal 8M0204693 Replaces 830749
The Mercury 8M0204693 drain plug seal is a genuine OEM Mercury sealing washer used on many Mercury and Mariner outboards, Mercury Racing lower units, Verado gearcases, and MerCruiser sterndrives.
This seal replaces Mercury part number 830749 and is commonly used on lower unit drain screws, vent screws, and gear lube fill plugs to help prevent gearcase lubricant leaks during operation and storage.
Common Compatible Applications
| Application Family | Common Models | Use Location | OEM References |
|---|---|---|---|
| Mercury & Mariner Outboards | EFI, DFI, Optimax, FourStroke, SeaPro, Pro XS | Gearcase Drain & Fill Screws | 8M0204693, 830749 |
| Mercury Verado | L4, L6, V6 & V8 Verado Models | Lower Unit Drain & Vent Screws | 8M0204693, 830749 |
| Mercury Racing | 150R, 200R, 250R, 300R, 450R, 500R | SportMaster & Racing Gearcases | 8M0204693, 830749 |
| Mercury Racing Gearcases | SportMaster, TorqueMaster, HD Lower Units | Drain & Fill Screw Seal | 8M0204693, 830749 |
| MerCruiser Sterndrives | Alpha, Bravo, Blackhawk, NXT | Gear Lube Drain & Vent Screws | 8M0204693, 830749 |
| MerCruiser Performance Drives | M-Series, Zeus, Vazer | Gearcase Drain Plug Seal | 8M0204693, 830749 |
Mercury uses this drain plug sealing washer across a very large number of outboard lower units, Verado gearcases, Racing gearcases, and MerCruiser sterndrive applications.
The best way to confirm fitment is by matching your original seal or OEM part number.
Common OEM references include: 8M0204693 and 830749.
OEM Part Numbers & Cross References
| Brand | Part Number |
|---|---|
| Mercury | 8M0204693 |
| Mercury | 830749 |
What This Drain Plug Seal is Used For
The Mercury 8M0204693 seal washer is used during lower unit and sterndrive gear lube service to help seal drain screws and vent screws against lubricant leaks.
Replacing the seal washer during gear lube service helps maintain proper sealing pressure and helps reduce the risk of water intrusion into the gearcase.
Mercury recommends replacing drain plug seals during routine lower unit service and gear lube changes.
Key Features and Benefits
- Genuine OEM Mercury drain plug seal washer
- Replaces Mercury part number 830749
- Fits many Mercury outboards and MerCruiser sterndrives
- Fits Verado, Pro XS, Racing, FourStroke, and Optimax applications
- Fits many SportMaster and TorqueMaster gearcases
- Commonly used during lower unit gear lube service
- Helps prevent gear lube leaks and water intrusion
- Used on drain screws, vent screws, and fill plugs
- Designed for harsh marine environments
Part Details
- Part Number: 8M0204693
- Supersedes: 830749
- Product Type: Drain Plug Seal Washer
- Brand: Mercury Marine
- Application: Mercury Outboards & MerCruiser Drives
- Use Location: Lower Unit Drain, Fill & Vent Screws
- OEM Mercury Part: Yes
FAQ
What does Mercury 8M0204693 replace?
This drain plug seal replaces Mercury part number 830749.
What is this seal used for?
It seals lower unit drain screws, vent screws, and gear lube fill plugs
on Mercury outboards and MerCruiser sterndrives.
Does this fit Mercury Racing lower units?
Yes. This seal is commonly used on Mercury Racing SportMaster,
TorqueMaster, and HD lower units including 300R, 450R, and 500R applications.
Does this fit MerCruiser sterndrives?
Yes. This seal is used on many Alpha, Bravo, Blackhawk, NXT, Zeus,
and M-Series sterndrives.
Should drain plug seals be replaced during service?
Yes. Mercury recommends replacing drain plug seals during routine
gear lube service to help prevent leaks and water intrusion.
Is this a genuine Mercury part?
Yes. This is a genuine OEM Mercury Marine drain plug sealing washer.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed seals and washers are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
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18-2430-9
18-24301-9
8M0204693
830749
3R3074060M
5041203
895146
F50109
18-2430
20259
28634
28634A1
79953
79953A2
79953K04
79953Q04
79953Q2
79953T2
8M0204693
816610A1
816610A2
830749