Z6_GHK6HJC0OG6S20Q8HU3K6R0G63
Z7_GHK6HJC0OG6S20Q8HU3K6R0GM5
Z7_GHK6HJC0OG6S20Q8HU3K6R0GM7
Z7_GHK6HJC0OG6S20Q8HU3K6R0Q22
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OEM Thermostat Cover Gasket for Mercury & Tohatsu 4HP-30HP FourStroke

OEM Mercury & Tohatsu Thermostat Gasket

Mercury & Tohatsu 4HP-30HP FourStroke Thermostat Cover Gasket

Genuine OEM thermostat cover gasket used on many Mercury and Tohatsu 4-stroke outboards ranging from 4HP through 30HP. This gasket helps create a proper seal between the thermostat housing and engine components during cooling system service.

Commonly replaced during thermostat maintenance, cooling system repairs, or preventative service on compatible Mercury, Mariner, Nissan, and Tohatsu outboards.

Compatible Mercury Applications

Engine Range Engine Type Application Notes
4HP / 5HP / 6HP Mercury FourStroke Select models and serial ranges
8HP / 9.9HP Mercury FourStroke 209cc applications
9.9HP ProKicker Mercury FourStroke Select ProKicker applications
15HP / 20HP Mercury Carbureted & EFI FourStroke 2-cylinder applications
25HP / 30HP Mercury EFI FourStroke 3-cylinder applications including Jet models
15HP SeaPro Mercury FourStroke International SeaPro models

Compatible Tohatsu Applications

Engine Range Engine Type Application Notes
8HP / 9.8HP Tohatsu FourStroke Select MFS models
15HP / 20HP Tohatsu FourStroke Select EFI and carbureted models
25HP / 30HP Tohatsu FourStroke Select EFI applications
Nissan Marine FourStroke Outboards Select rebadged Tohatsu applications
Fitment Note: This thermostat gasket fits many Mercury and Tohatsu-built FourStroke outboards. Always verify your engine model and serial number before ordering to confirm exact fitment.

OEM Part Numbers & Cross References

Brand Part Numbers
Mercury 8M0214960, 853702, 853702005, 898101194
Tohatsu 3H6010320, 3H6010320M, 346010320, 346010320M, 350020320, 350020320M
Sierra 18-60920
Mallory 9-60920

What This Thermostat Gasket is Used For

This OEM thermostat cover gasket is used to properly seal the thermostat housing during cooling system operation on compatible Mercury and Tohatsu outboards.

Replacing the gasket during thermostat service helps prevent coolant leaks, improper thermostat sealing, and cooling system pressure loss.

Thermostat gaskets are commonly replaced whenever the thermostat housing is removed for inspection, thermostat replacement, or routine maintenance.

Using the correct OEM gasket helps maintain proper fitment and sealing performance in harsh freshwater and saltwater marine environments.

Key Features and Benefits

  • Genuine OEM Mercury and Tohatsu thermostat gasket
  • Fits many 4HP-30HP FourStroke outboards
  • Helps seal thermostat housing properly
  • Supports cooling system reliability
  • Common replacement during thermostat service
  • Designed for marine cooling system environments
  • OEM-quality fit and material construction
  • Compatible with multiple Mercury and Tohatsu platforms

Thermostat Gasket Details

  • Part Type: Thermostat Cover Gasket
  • Primary OEM Number: 8M0214960
  • Application: Mercury & Tohatsu FourStroke Outboards
  • Horsepower Range: 4HP-30HP
  • System: Engine Cooling System
  • Use: Thermostat housing sealing
  • Material: OEM marine gasket material

FAQ

What does this thermostat gasket fit?
This gasket fits many Mercury and Tohatsu-built 4-stroke outboards ranging from 4HP through 30HP depending on model and serial range.

Should I replace the gasket when replacing the thermostat?
Yes. It is recommended to replace the thermostat gasket whenever the thermostat housing is removed to help ensure a proper seal.

Is this an OEM Mercury part?
Yes. This is a genuine OEM-style thermostat gasket cross-referenced to Mercury part number 8M0214960 and related superseded numbers.

Does this fit Tohatsu and Nissan outboards?
Yes. Many Mercury small FourStroke outboards are manufactured by Tohatsu, and this gasket also cross references to several Tohatsu and Nissan Marine part numbers.

Can a damaged thermostat gasket cause cooling issues?
Yes. A leaking or damaged gasket can contribute to improper thermostat operation, coolant leakage, or inconsistent engine temperatures.

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.

Apply for a Dealer Account

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 Terms

8M0214960, 853702, 853702005, 898101194, 3H6010320, 3H6010320M, 346010320, 346010320M, 350020320, 350020320M, thermostat gasket, Mercury thermostat gasket, Tohatsu thermostat gasket, Mercury 25HP thermostat gasket, Mercury 30HP thermostat gasket, Tohatsu thermostat cover gasket, Nissan Marine thermostat gasket, Sierra 18-60920

Item#:
8M0214960
Cross Reference#:
18-60920
3H6010320
3H6010320M
346010320
346010320M
350020320
350020320M
5040066
8M0214960
853702
853702005
898101194
Manufacturer Item:
8M0214960
Manufacturer:
Tohatsu/Nissan
Available:
In Stock
Your Price:
2.25
Each
Yamaha V6, Seadoo Tohatsu 90-120hp
Item#:
208
Cross Reference#:
31-07646
93306-208U0-00
93306-208U0-00
Manufacturer Item:
93306-208U0-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
28.07
Each
Tecno Seal Replacement Engine Anode for Suzuki, Honda, Tohatsu and BRP

Replacement Outboard Zinc Anode

55321-87J10P Zinc Anode for Suzuki, Honda, Tohatsu and Johnson / Evinrude

The 55321-87J10P zinc anode is a replacement sacrificial anode used across a wide range of Suzuki DF outboards and select Honda, Tohatsu, Johnson and Evinrude applications.

It cross-references several OEM anode numbers including 55321-87J00, 55321-87J01, 12155-ZV5-000, 12155-ZV5-010, 5031705, 0778299 and related references.

55321-87J10P

Part Type: Sacrificial Zinc Anode
OEM or Aftermarket: Aftermarket
Primary Application: Suzuki DF Four-Stroke Outboards
Additional Applications: Honda, Tohatsu, Johnson and Evinrude
Item #: 55321-87J10P

OEM and Cross Reference Numbers

Part Number Brand / Reference
55321-87J00 Suzuki OEM Reference
55321-87J01 Suzuki OEM Reference
12155-ZV5-000 Honda OEM Reference
12155-ZV5-010 Honda OEM Reference
HZV5-12155-000 Cross Reference
HZV512155000 Cross Reference
5031705 Johnson / Evinrude Reference
0778299 Johnson / Evinrude Reference
778299 Johnson / Evinrude Reference

What This Part is Used For

This zinc anode is part of the corrosion-protection system used on compatible outboard engines. The sacrificial anode is designed to deteriorate in place of more expensive metal engine components exposed to water and the marine environment.

Anodes should be inspected during routine maintenance and replaced when they become substantially deteriorated. The number of 55321-87J10P-style anodes installed on an engine varies by model.

Important Fitment and Quantity Note

This anode appears across many different outboard models, years and serial-number ranges. The quantity required also varies by engine.

Verify the exact engine model and serial number before ordering the quantity needed for a complete anode service.

Suzuki Outboard Fitment

Supplied application data includes Suzuki DF engines ranging from small portable outboards through DF350A models. Applicable sub-models and serial ranges vary.

Engine Family Included Suzuki Applications
DF2.5-DF20 DF2.5, DF4, DF4A, DF5A, DF6, DF6A, DF8A, DF9.9, DF9.9A, DF9.9B, DF15, DF15A and DF20A families
DF25-DF60 DF25, DF25A, DF30, DF30A, DF40, DF40A, DF50, DF50A, DF60 and DF60A families including applicable Q, R, T, TH, QH, TL, VT and related variants
DF70-DF100 DF70, DF70A, DF75, DF80A, DF90, DF90A, DF100, DF100A, DF100B and DF100C families
DF115-DF140 DF115, DF115A, DF115B, DF115BG, DF115BS, DF115BSS, DF115BT, DF115BZ, DF115BZG, DF140, DF140A, DF140B, DF140BG, DF140BT, DF140BZ and DF140BZG
DF150-DF200 DF150, DF150AP, DF150AS, DF150AT, DF150AZ, DF175, DF175AP, DF175AT, DF175AZ, DF200, DF200A, DF200AP, DF200AST, DF200AT, DF200AZ, DF200T and DF200Z
DF225-DF300 DF225, DF225T, DF225Z, DF250, DF250A, DF250AP, DF250ST, DF250T, DF250Z, DF300, DF300A, DF300AP and DF300B families
DF325-DF350 DF325A and DF350A families including applicable MD variants

Honda Outboard Fitment

The supplied application data includes a broad range of Honda marine engines. Honda fitment is model and VIN specific, so the engine family alone should not be used as the only fitment check.

Honda Family Included Models / VIN Families
BF25 BF25A, BF25A1, BF25A2, BF25A3, BF25AW, BF25AX, BF25AY, BF25D4, BF25D5, BF25D6, BF25DK0, BF25DK2 and BF25DK3. Supplied VIN families include BAJL, BAJS, BAJU and BATJ.
BF30 BF30A, BF30A1, BF30A2, BF30A3, BF30AW, BF30AX, BF30AY, BF30D4, BF30D5, BF30D6, BF30DK0, BF30DK2 and BF30DK3. Supplied VIN families include BAWL, BAWS and BAUJ.
BF35 / BF40 / BF45 BF35AM, BF40A, BF40A1-A6, BF40AK0, BF40AW, BF40AX, BF40AY, BF40D, BF40DK2, BF40DK4 and BF45AM.
BF50 / BF60 / BFP60 BF50A, BF50A1-A6, BF50AK0, BF50AW, BF50AX, BF50AY, BF50D, BF50DK2, BF50DK4, BF60A, BF60AK1, BFP60A and BFP60AK1.
BF75 / BF90 BF75A1-A6, BF75AT, BF75AW, BF75AX, BF75AY, BF75DK0, BF75DK2-DK4, BF90A1-A6, BF90AT, BF90AW, BF90AX, BF90AY and BF90DK0-DK5.
BF100 / BF115 BF100A, BF100AK1, BF115AX, BF115AY, BF115A1-A6, BF115AK0, BF115D, BF115DK1 and BF115J. Supplied VIN families include BBMJ, BZBD, BZBG, BBHJ and BBWJ.
BF130 / BF135 / BF140 BF130AX, BF130AY, BF130A1-A4, BF135A4-A6, BF135AK0, BF135AK2 and BF140A.
BF150 / BF175 BF150A4-A6, BF150AK0, BF150AK2, BF150D, BF175AK1 and BF175AK2.
BF200 BF200A2-A6, BF200AK0-AK3 and BF200D. Supplied VIN families include BAEJ, BAFJ and BBRJ.
BF225 BF225A2-A6, BF225AK0-AK3 and BF225D. Supplied VIN families include BAGJ, BAHJ and BBPJ.
BF250 BF250A and BF250D families including L, X, XX, U and counter-rotation variants. Supplied VIN families include BBJJ and BBNJ.
Honda Fitment is VIN Specific

The attached application data contains specific Honda VIN ranges for many models. Match the model and VIN to the correct application before ordering rather than assuming all engines of the same horsepower use this anode.

Tohatsu Outboard Fitment

The following Tohatsu horsepower and year applications were supplied for this anode:

Horsepower Years Listed
60 HP 2014-2019
75 HP 2014-2019
90 HP 2014-2019
115 HP 2014-2019
150 HP 2014-2019 and select 2021-2025 applications
200 HP 2014-2019 and 2021-2025
225 HP 2014-2019 and 2021-2025
250 HP 2014-2019 and 2021-2025

Johnson and Evinrude Outboard Fitment

The supplied fitment includes numerous Suzuki-built Johnson and Evinrude four-stroke engines. Common application groups are shown below.

HP Family Included Model Families
2-6 HP Select J2, J4, J5 and J6 four-stroke models including R and RL variants.
25-30 HP E25, E30, J25, J30 and BJ25 families including electric-start, rope-start, tiller, remote and power-trim variants.
40-70 HP E40, E50, E70, J40, J50, J60, J70 and corresponding BJ40-BJ70 four-stroke families.
90 HP J90 and BJ90 PL / PX four-stroke families including SDA, SOR, SRC and STS variants.
115 HP J115 and BJ115 L / PL / PX / X four-stroke model families.
140 HP J140 and BJ140 CX / L / PL / PX / X four-stroke model families.
200 HP J200 and BJ200 CX / PX / X four-stroke model families.
225 HP J225 and BJ225 CX / PX / X / Z four-stroke model families.
Johnson / Evinrude Fitment Note

Fitment is based on specific four-stroke model numbers in the supplied application data. Verify the complete engine model number before ordering.

Related Anode Cover O-Rings

When servicing an internal engine anode, inspect the associated anode-cover O-ring. The O-ring should be replaced if it is cut, hardened, flattened, stretched or damaged.

Pro Marine 22019 Anode Cover O-Ring

Pro Marine 22019 is the aftermarket replacement for Suzuki 09280-22019 and is a convenient option when replacing internal anodes during routine service.

View Pro Marine 22019 O-Ring

Suzuki OEM 09280-22019 Anode Cover O-Ring

Prefer a genuine Suzuki sealing component? The OEM 09280-22019 anode cover O-ring is also available separately.

View OEM Suzuki 09280-22019

Installation and Service Tips

  • Inspect sacrificial engine anodes during scheduled or annual maintenance.
  • Replace heavily deteriorated anodes before they are completely consumed.
  • Inspect the associated O-ring whenever an anode cover is removed.
  • Replace damaged, hardened, flattened or stretched O-rings.
  • Confirm how many anodes are required for your specific engine.
  • Use the complete engine model and serial or VIN when checking fitment.
  • Follow the manufacturer's service procedure when reinstalling anode covers and fasteners.

Key Features and Benefits

  • Multi-Brand Application: Fits specified Suzuki, Honda, Tohatsu, Johnson and Evinrude outboards.
  • Suzuki Cross Reference: Replaces 55321-87J00 and 55321-87J01 applications.
  • Honda Cross Reference: Cross-references 12155-ZV5-000 and 12155-ZV5-010.
  • BRP Cross Reference: Cross-references select 5031705 and 0778299 applications.
  • Corrosion Protection: Sacrificial zinc helps protect compatible metal components from galvanic corrosion.
  • Service O-Rings Available: Both OEM Suzuki and Pro Marine anode-cover O-rings are available separately.

FAQ

What does 55321-87J10P replace?
It cross-references Suzuki 55321-87J00 and 55321-87J01, Honda 12155-ZV5-000 and 12155-ZV5-010, Johnson / Evinrude 5031705 and 0778299, along with additional supplied cross references.

What Suzuki outboards does this anode fit?
The supplied application data includes Suzuki models ranging from DF2.5 through DF350A. Exact sub-model and serial fitment varies, so verify the full engine model before ordering.

Does this fit Honda outboards?
Yes. The supplied application data includes many Honda families from BF25 through BF250, including specific model and VIN ranges.

Does this fit Tohatsu outboards?
Yes. Supplied fitment includes select Tohatsu 60, 75, 90, 115, 150, 200, 225 and 250 HP applications. Year coverage varies by horsepower.

Does this fit Johnson and Evinrude outboards?
Yes. The supplied fitment includes numerous Suzuki-built Johnson and Evinrude four-stroke applications from small portable models through 225 HP.

How many zinc anodes does my engine require?
The quantity varies by engine model. Some engines use multiple 55321-87J10P-style anodes, so check the engine diagram or service information before selecting a quantity.

Should I replace the O-ring when changing the anode?
Inspect the O-ring whenever the anode cover is removed. Replace it if it is damaged, flattened, hardened or otherwise unsuitable for reuse.

Is an OEM Suzuki O-ring available?
Yes. Suzuki 09280-22019 is available separately. Pro Marine 22019 is also available as an aftermarket alternative.

Dealer Discounts & Store Policies

Dealer / Marine Industry Discounts

Are you a marine dealer, technician, boat builder, repair facility, or marine industry professional? Pro Marine USA offers dealer pricing for qualified businesses.

Apply for a Dealer Account

Shipping Policy

  • Free shipping on orders over $100 in the 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 are accepted within 30 days.
  • Parts must be new, unused, and in original packaging.
  • Installed parts are not returnable.
  • Return authorization is required before sending items back.

Need help confirming fitment or determining how many anodes your engine requires? Contact Pro Marine USA or call 941-721-3000.


Searchable Part Numbers

55321-87J10P, 55321-87J00, 55321-87J01, HZV5-12155-000, HZV512155000, 12155-ZV5-000, 12155-ZV5-010, 5031705, 0778299, 778299

Searchable Terms

Suzuki zinc anode, Suzuki DF anode, Suzuki DF115 anode, Suzuki DF140 anode, Suzuki DF150 anode, Suzuki DF200 anode, Suzuki DF250 anode, Suzuki DF300 anode, Suzuki DF350 anode, Honda outboard zinc anode, Honda 12155-ZV5-000, Honda BF90 anode, Honda BF115 anode, Honda BF150 anode, Honda BF225 anode, Honda BF250 anode, Tohatsu zinc anode, Tohatsu 150 anode, Tohatsu 200 anode, Tohatsu 225 anode, Tohatsu 250 anode, Johnson four stroke anode, Evinrude four stroke anode, 5031705 anode, 0778299 anode, outboard sacrificial zinc anode

Item#:
55321-87J10P
Cross Reference#:
HZV5-12155-000
HZV5-12155-010
HZV512155000
HZV512155010
0778299
12155-ZV5-000
5031705
55321-87J00
55321-87J01
778299
Manufacturer Item:
55321-87J01
Manufacturer:
Tecno Seal
Available:
In Stock
Your Price:
4.82
Each
Wiseco 4-Stroke 94.50mm Bore
Item#:
9450XX
Manufacturer:
Wiseco
Available:
In Stock
Your Price:
35.09
Each
Bore Size 2.668
Item#:
2668KD
Manufacturer:
Wiseco
Available:
In Stock
51.2700
Your Price:
49.95
Each
Bore Size 2.894
Item#:
2894CD
Manufacturer:
Wiseco
Available:
Out of Stock
50.7800
Your Price:
49.95
Each
Bore Size 2.913
Item#:
2913CD
Manufacturer:
Wiseco
Available:
In Stock
50.7800
Your Price:
49.95
Each
Bore Size 3.385
Item#:
3385KD
Manufacturer:
Wiseco
Available:
In Stock
Your Price:
49.95
Each
Bore Size 2.913
Item#:
2913KD
Manufacturer:
Wiseco
Available:
Out of Stock
51.2700
Your Price:
49.95
Each
Bore Size 3.012
Item#:
3012TD
Manufacturer:
Wiseco
Available:
In Stock
Your Price:
54.95
Each
Bore Size 3.012
Item#:
3012TC
Manufacturer:
Wiseco
Available:
Out of Stock
26.7600
Your Price:
24.95
Each
Bore Size 2.975
Item#:
2975KD
Manufacturer:
Wiseco
Available:
In Stock
51.2700
Your Price:
49.95
Each
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