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Mercury Outboard Parts
Shop Mercury outboard motor parts by system, including cooling, fuel delivery, electrical, internal engine components, lower unit parts, and routine service items. Browse OEM and replacement Mercury marine parts to support maintenance, repair, and rebuild projects.
Shop by System
- Complete Powerheads
- Control Cables & Boxes
- Cooling System
- Cowlings & Components
- Electrical System
- Engine Oil
- Engine Rebuild Kits
- Fuel & Carburetion System
- Intake System
- Internal Engine Components
- Lower Unit Components
- Oiling System
- Paints
- Service & Oil Change Kits
- Service Manuals
- Steering Systems
- Throttle Components
- Transom & Midsection
- Trim System
- Wizard Performance Parts
Common Mercury Outboard Model References
This category supports many popular Mercury outboards across a wide horsepower range. Always confirm your model and serial number for best fitment.
- Portable & Midrange: 2.5HP–60HP (2-stroke & FourStroke)
- Performance: Pro XS and EFI platforms (75HP–300HP)
- Direct Injection: Optimax models (75HP–250HP)
- Premium Offshore: Verado models (135HP–400HP)
- Commercial: SeaPro models (commonly 75HP–300HP)
Always confirm your exact horsepower, model year, and serial number to ensure proper part compatibility before ordering.
8M0153723
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
Mercury Shock Rod Kit 8M0168235
The Mercury 8M0168235 Shock Rod Kit is an OEM replacement kit used in the power trim system on select Mercury outboards. This updated kit is designed for newer trim assemblies and helps maintain smooth, controlled engine movement during trim operation.
Fitment Overview
This shock rod kit fits select Mercury 105HP Jet, 135HP, and 150HP FourStroke outboards using the newer power trim assembly design for serial numbers 2B752836 and up. If your engine falls in the earlier serial range, Mercury used a different shock rod assembly.
Compatibility
| Engine Model | Horsepower | Serial Range |
|---|---|---|
| Mercury Jet | 105 HP | 2B752836 and Up |
| Mercury FourStroke | 135 HP | 2B752836 and Up |
| Mercury FourStroke | 150 HP | 2B752836 and Up |
| Mercury FourStroke | 150 HP Pro XS | 3B020121 and Up |
Fits These Serial Ranges
Confirmed application: Mercury 105HP Jet, 135HP, and 150HP models using the updated power trim assembly design for serial numbers 2B752836 and newer.
Important: This kit is for engines after the serial break. If your engine is
serial number 2B752836 and below, order the earlier shock rod assembly instead:
Mercury Shock Rod Assembly 8M0060145 for 2B752836 and Below
Part Numbers and Cross References
| Type | Part Number |
|---|---|
| Mercury OEM | 8M0168235 |
| Application | Shock Rod Kit |
| System | Power Trim Assembly |
What This Part Is Used For
This shock rod kit is used inside the power trim assembly to support smooth engine movement and proper trim operation. It helps control internal motion within the trim system and reduces stress on surrounding trim components.
- Used in Mercury power trim assemblies
- Supports smooth trim and tilt operation
- Helps control internal movement of trim components
- Designed for the updated trim assembly version
If you are servicing the trim system on a compatible Mercury outboard, this kit helps restore proper function and reliable trim performance.
System Function and Connections
- System Type: Hydraulic power trim
- Location: Inside the power trim assembly
- Related Components: Trim pump, pistons, cylinders, and bracket components
FAQ
What does Mercury 8M0168235 fit?
It fits Mercury 105HP Jet, 135HP, and 150HP outboards using the newer power trim assembly for serial numbers 2B752836 and up.
How do I know if I need this kit or the earlier version?
Check your engine serial number. If your engine is 2B752836 and up, this is the correct kit. If it is 2B752836 and below, you need the earlier 8M0060145 shock rod assembly.
Is this part used in the steering system?
No. This is a power trim assembly component.
Why does the serial number break matter?
Mercury updated the trim assembly design, so different shock rod parts are used before and after the 2B752836 serial break.
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.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Part Numbers
8M0168235, Mercury shock rod kit, Mercury 105HP Jet shock rod kit, Mercury 135HP shock rod kit, Mercury 150HP shock rod kit, Mercury trim assembly 2B752836 and up, 150hp ProXS 3C020121 and Up
8M0153722
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18-6773
8M0031551
8M0143217
8M0168223
8M0231194
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821821A2
826729A07
826729A08
826729A09
826729A10
826729A4
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8M0214927
Tecno Seal Aluminum Anode Kit for Mercury L6 Verado
Mercury L6 Verado 350HP-400HP Aluminum Anode Kit
The Tecno Seal 20817 aluminum anode kit is designed for compatible Mercury L6 Verado 350HP-400HP outboards. This kit helps protect submerged metal components from the harmful effects of galvanic corrosion.
Tecno Seal is a reputable marine anode manufacturer known for producing quality corrosion protection components for Mercury and other major marine applications.
Compatible Applications
| Brand | Horsepower Range | Engine Family | Application Notes |
|---|---|---|---|
| Mercury | 350HP-400HP | Inline 6-Cylinder Verado | Compatible high horsepower L6 Verado outboards |
This aluminum anode kit is intended for compatible Mercury L6 Verado 350HP-400HP outboards and helps protect gearcase, transom, and other exposed metal components from galvanic corrosion.
Inspect anodes annually and replace them when they show heavy corrosion, pitting, or significant material loss.
This 20817 anode kit is for Mercury L6 Verado 350HP-400HP models. If you have a Mercury L6 Verado 200HP-300HP model, use the VER6 anode kit linked below.
What is Included
| Included Component | Application |
|---|---|
| Aluminum Anode Set | Replacement corrosion protection for compatible L6 Verado models |
| Transom / Bracket Anodes | Corrosion protection for exposed bracket and transom components |
| Gearcase Anodes | Corrosion protection for lower unit and gearcase components |
| Installation Hardware | Anode replacement installation |
Other L6 Verado Anode Kit
Mercury L6 Verado 200HP-300HP Anode Kit
Tecno Seal aluminum anode kit for Mercury inline 6-cylinder Verado 200HP-300HP models.
View ProductComplete Your Service
Mercury L6 Verado Service Kits
Shop Mercury L6 Verado 100 hour service kits for compatible 200HP-400HP Verado outboards, including options with and without oil.
View 100 Hour Kits
Mercury L6 Verado 300 Hour Kits
Shop Mercury L6 Verado 300 hour service kits for major scheduled maintenance on compatible inline 6-cylinder Verado outboards.
View 300 Hour KitsWhat This Anode Kit is Used For
The Tecno Seal 20817 aluminum anode kit is used to replace worn or corroded sacrificial anodes on compatible Mercury L6 Verado 350HP-400HP outboards.
Sacrificial anodes help protect the gearcase, transom bracket, and other submerged metal components from galvanic corrosion caused by electrical activity in freshwater or saltwater environments.
Periodic anode inspection and replacement is an important part of routine outboard maintenance, especially for boats operated in saltwater or stored in the water for extended periods.
Aluminum anodes are commonly used for modern marine applications because they provide strong corrosion protection in both freshwater and saltwater.
Key Features and Benefits
- Tecno Seal aluminum anode kit for Mercury L6 Verado outboards
- Fits Mercury inline 6-cylinder 350HP-400HP Verado models
- Helps protect gearcase, transom, and exposed metal components
- Helps protect against galvanic corrosion
- Designed for fast inspection and replacement
- Aluminum construction for freshwater and saltwater use
- Includes installation hardware
- Supports annual corrosion protection maintenance
- Quality replacement option from a reputable anode manufacturer
Anode Kit Details
- Part Number: 20817
- Brand: Tecno Seal
- Material: Aluminum
- Water Type: Freshwater & Saltwater
- Engine Compatibility: Mercury Inline 6-Cylinder Verado
- Horsepower Range: 350HP-400HP
- Installation Hardware: Included
- Service Area: Transom, bracket, and gearcase anodes
FAQ
What engines does this 20817 anode kit fit?
This kit fits compatible Mercury inline 6-cylinder Verado 350HP-400HP outboards.
Is this the correct anode kit for Mercury L6 Verado 200HP-300HP models?
No. Mercury L6 Verado 200HP-300HP models use the VER6 anode kit, linked above.
Who makes this anode kit?
This 20817 anode kit is made by Tecno Seal, a reputable manufacturer of marine
sacrificial anodes and corrosion protection products.
Can aluminum anodes be used in saltwater?
Yes. Aluminum anodes are commonly used in both freshwater and saltwater
applications.
How often should I inspect my anodes?
Inspect anodes at least annually and replace them when they show heavy
corrosion, pitting, or significant material loss.
Does this kit include installation hardware?
Yes. Installation hardware is included for anode replacement.
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.
- Items must be new, unused, and in original packaging.
- Installed or used corrosion protection components may not be 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
20817, Mercury L6 Verado 350HP anode kit, Mercury L6 Verado 400HP anode kit, Mercury inline 6 Verado anode kit, Mercury 350HP Verado anodes, Mercury 400HP Verado anodes, Mercury aluminum anode kit, Tecno Seal 20817, Tecnoseal 20817, Mercury transom anodes, Mercury gearcase anodes, Mercury L6 Verado service kits, Mercury L6 Verado 100 hour kit, Mercury L6 Verado 300 hour kit, Mercury corrosion protection kit, VER6, Mercury L6 Verado 200HP-300HP anode kit
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8M0217561
806105
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