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Thermostats & Cooling Components - Marine Engine Parts

Marine Thermostats & Cooling Components

Marine Thermostats, Pumps, Impellers, Heat Exchangers, Hoses & Cooling Parts

Shop marine cooling system parts for inboard, sterndrive, outboard, gas, and diesel engines. Find thermostats, thermostat housings, raw-water pumps, circulation pumps, impellers, heat exchangers, oil coolers, strainers, coolant caps, hoses, clamps, gaskets, seals, temperature senders, and cooling service parts.

Shop Cooling Components Thermostats Impellers
Fitment Check

Match cooling parts by engine brand, model, serial number, existing part number, cooling layout, hose size, thermostat temperature, and pump style.

Ask Parts Desk

Overheating can come from more than one part. Check the full cooling path before assuming a thermostat, pump, impeller, hose, strainer, or heat exchanger is the only issue.

Find Cooling Parts Faster

Search by Part Number, Engine Model, Temperature, Hose Size, or Cooling Symptom

Use the search box for thermostats, thermostat housings, raw-water pumps, circulation pumps, impellers, coolers, hoses, clamps, strainers, caps, seals, senders, and cooling kits.

Popular Cooling Product Searches

ThermostatsMarine engine thermostats by brand, temperature, and application Thermostat HousingsHousings, covers, seals, bolts, and temperature-control hardware ImpellersRaw-water pump impellers and impeller service searches Raw-Water PumpsSeawater pumps, covers, cams, wear plates, and repair parts Water PumpsCirculation pumps, cooling pumps, and engine water pump searches Heat ExchangersHeat exchangers, end caps, tube bundles, gaskets, and seals Oil CoolersEngine oil, transmission, power steering, and fuel cooler searches Sea StrainersStrainers, caps, baskets, gaskets, and intake support Cooling HosesCoolant hose, seawater hose, molded hose, and replacement hose Hose ClampsStainless clamps, T-bolt clamps, and cooling hose hardware CoolantCoolant, antifreeze, additives, and closed-cooling fluid searches Pressure CapsCoolant caps, recovery caps, expansion tank caps, and seals Temp SendersTemperature senders, sensors, switches, alarms, and gauge support GasketsPump, thermostat, heat exchanger, cooler, and housing gaskets Seals & O-RingsO-rings, washers, end-cap seals, and cooling service parts Cooling KitsGrouped service parts for cooling-system maintenance

Raw-Water Side

Seawater Flow Protects the Engine and Exhaust

Raw-water systems depend on a clean intake path, healthy impeller, strong pump, good hoses, clear strainers, clean coolers, and proper exhaust water flow. Weak seawater flow can cause overheating quickly.

Raw-Water PumpsImpellersSea Strainers

Closed Cooling

Thermostats, Coolant, and Heat Exchangers Control Temperature

Closed-cooling systems depend on the right coolant, thermostat, circulation pump, pressure cap, heat exchanger, hoses, seals, and clean passages to keep engine temperature stable.

ThermostatsHeat ExchangersCoolant
TEMP

Control Temperature

Thermostats, senders, pumps, coolant, caps, and heat exchangers all affect stable operating temperature.

FLOW

Protect Water Flow

Impellers, strainers, hoses, clamps, pump covers, and coolers should be inspected when flow seems weak.

SEAL

Replace Seals Carefully

Use the correct gaskets, O-rings, washers, caps, and clamps when cooling parts are opened.

Cooling Service Help

Overheating Usually Deserves a Full-System Look

Replacing one part may not solve a cooling issue if the root cause is a clogged strainer, worn impeller, failing thermostat, soft hose, leaking cap, weak pump, blocked heat exchanger, air leak, or exhaust restriction.

Overheating SearchesCooling KitsAsk Parts Desk
Inspect seawater flowCheck seacock, strainer, hoses, impeller, pump cover, cam, wear plate, and discharge flow.
Check closed coolingConfirm coolant condition, coolant level, pressure cap, thermostat, circulation pump, and heat exchanger condition.
Watch for corrosionSalt trails, pitting, green deposits, clogged passages, and leaking end caps are warning signs.

Cooling Components FAQ

Choosing Marine Thermostats and Cooling Parts

How do I find the right marine thermostat?

Start with the engine brand, model, serial number, current thermostat part number, thermostat temperature rating, and housing style. Similar thermostats may not fit or operate correctly.

What causes a marine engine to overheat?

Common causes include worn impellers, clogged strainers, blocked heat exchangers, failing thermostats, soft hoses, weak pumps, low coolant, exhaust restrictions, or air leaks on the intake side.

Should gaskets and O-rings be replaced during cooling service?

Yes. When opening cooling components, use the correct replacement gaskets, O-rings, washers, seals, and clamps for the part and engine model.

Can the Parts Desk help identify cooling parts?

Yes. Send the engine brand, model, serial number, photos of the part, hose diameter, old part numbers, and the symptom you are trying to solve.

Shop Marine Thermostats, Pumps, Impellers, Heat Exchangers, Hoses & Cooling Parts

Find the cooling components and service parts needed to keep marine engines flowing properly and running at the right temperature.

Shop Cooling ComponentsConfirm Fitment

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PCM Thermostat 170°F Closed Cooling – R026007

$84.68 - $84.68
$84.68
$84.68 - $84.68
$84.68
Out of stock

The PCM R026007 Thermostat is a genuine OEM 170°F thermostat designed specifically for fresh water cooled (closed cooling) PCM and Crusader marine ...

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$84.68 - $84.68
$84.68
$84.68 - $84.68
$84.68
Sold out

Volvo Penta Thermostat Kit – 3831426

$81.00 - $81.00
$81.00
$81.00
$81.00 - $81.00
$81.00
Only 2 left!

The Volvo Penta 3831426 Thermostat Kit is a genuine OEM cooling system service kit designed to regulate engine temperature and maintain optimal per...

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$81.00 - $81.00
$81.00
$81.00
$81.00 - $81.00
$81.00

Mercury MerCruiser Quicksilver Thermostat Assembly 8M0174561

$323.01 - $323.01
$323.01
$323.01
$323.01 - $323.01
$323.01
Only 3 left!

Mercury MerCruiser / Quicksilver Thermostat Assembly – 8M0174561 Maintain proper engine cooling and operating temperature with the genuine Mercury ...

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$323.01 - $323.01
$323.01
$323.01
$323.01 - $323.01
$323.01

PCM 160°F Thermostat with 156-Hole Housing 97895

$58.64 - $58.64
$58.64
$58.64 - $58.64
$58.64
Only 3 left!

PCM 160°F Thermostat with 156-Hole HousingKeep your PCM inboard engine running at its optimal operating temperature with this OEM-spec 160°F thermo...

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$58.64 - $58.64
$58.64
$58.64 - $58.64
$58.64
Kohler Thermostat

Sierra Thermostat — Kohler Marine Engines — 47-233608

$29.79 - $29.79
$29.79
$29.79 - $29.79
$29.79

Sierra Thermostat — Kohler Marine Engines — 47-233608 A direct-fit replacement thermostat for compatible Kohler marine engines. The thermostat regu...

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$29.79 - $29.79
$29.79
$29.79 - $29.79
$29.79

Raritan WH16 Thermostat Assembly — Marine Water Heater Replacement Part (78-WH16)

$215.49 - $215.49
$215.49
$215.49 - $215.49
$215.49

OEM Thermostat Assembly for Raritan Marine Water HeatersThe Raritan WH16 Thermostat Assembly (78-WH16) is the factory replacement thermostat for Ra...

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$215.49 - $215.49
$215.49
$215.49 - $215.49
$215.49

Jabsco 6-Hole Pump End Cover Plate - JAB-11831-0000

$0.00 - $0.00
$0.00
$67.25
$67.25 - $67.25
$67.25
Only 1 left!

The Jabsco 11831-0000 Pump End Cover Plate is a replacement end cover for compatible Jabsco flexible impeller engine-cooling pumps. This 6-hole cov...

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$0.00 - $0.00
$0.00
$67.25
$67.25 - $67.25
$67.25

Mercury - Water Distributor Thermostat Housing Gasket - 27-475901

$0.00 - $0.00
$0.00
$4.99
$4.99 - $4.99
$4.99
Only 5 left!

The Mercury MerCruiser Quicksilver 27-475901 Gasket is an OEM cooling-system sealing gasket used on select Mercury MerCruiser sterndrive engines. I...

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$0.00 - $0.00
$0.00
$4.99
$4.99 - $4.99
$4.99

Sierra - Water Temperature Sender Dual Station 3/8"-18 NPT - SIE-18-5897

$58.23 - $58.23
$58.23
$58.23
$58.23 - $58.23
$58.23
Only 2 left!

The Sierra Marine 18-5897 Water Temperature Sender is a dual-station marine engine temperature sending unit for compatible inboard and sterndrive g...

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$58.23 - $58.23
$58.23
$58.23
$58.23 - $58.23
$58.23
Sold out

Volvo Penta - Charge Air Cooler Thermostat Kit - 3588437

$0.00 - $0.00
$0.00
$250.00
$250.00 - $250.00
$250.00
Out of stock

The Volvo Penta 3588437 is a genuine OEM charge air cooler thermostat kit used on select Volvo Penta D4 and D6 marine diesel engines. This kit serv...

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$0.00 - $0.00
$0.00
$250.00
$250.00 - $250.00
$250.00
Sold out

Mercury MerCruiser Quicksilver Thermostat Gasket 62386001

$3.84 - $3.84
$3.84
$3.84 - $3.84
$3.84
Only 2 left!

Mercury MerCruiser Quicksilver 27-62386001 is a thermostat gasket used to seal the thermostat housing area on select Mercury / Mariner outboard and...

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$3.84 - $3.84
$3.84
$3.84 - $3.84
$3.84

Mercury MerCruiser Quicksilver Thermostat Housing Gasket 806871

$13.98 - $13.98
$13.98
$13.98 - $13.98
$13.98
Only 4 left!

Mercury MerCruiser Quicksilver 27-806871 is a thermostat housing gasket used on select MerCruiser gasoline engines. It seals the thermostat housing...

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$13.98 - $13.98
$13.98
$13.98 - $13.98
$13.98

Mercury Thermostat Cover Gasket 14318005

$5.15 - $5.15
$5.15
$5.15
$5.15 - $5.15
$5.15
Only 3 left!

Mercury 14318005 is a genuine OEM thermostat cover gasket for select Mercury and Mariner 2-stroke outboards. Current Mercury dealer references iden...

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$5.15 - $5.15
$5.15
$5.15
$5.15 - $5.15
$5.15

Mercury MerCruiser Thermostat Retainer 861949T

$67.49 - $67.49
$67.49
$67.49
$67.49 - $67.49
$67.49
Only 1 left!

Mercury MerCruiser Quicksilver 861949T is a genuine OEM thermostat retainer used in MerCruiser big-block cooling-system assemblies. Current Mercury...

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$67.49 - $67.49
$67.49
$67.49
$67.49 - $67.49
$67.49

Volvo Penta Thermostat Housing Cover O-Ring 3858938

$8.10 - $8.10
$8.10
$8.10 - $8.10
$8.10
Only 2 left!

Volvo Penta 3858938 is a genuine OEM O-ring used in select Volvo Penta sealing applications. Current active parts listings consistently identify it...

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$8.10 - $8.10
$8.10
$8.10 - $8.10
$8.10

Volvo Penta Thermostat Cooling O-Ring 3586514

$26.10 - $26.10
$26.10
$26.10 - $26.10
$26.10
Only 2 left!

Volvo Penta 3586514 is a genuine OEM O-ring used in select Volvo Penta cooling-system service applications. Current dealer and distributor referenc...

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$26.10 - $26.10
$26.10
$26.10 - $26.10
$26.10

Volvo Penta Thermostat Cooling O-Ring 3583830

$15.10 - $15.10
$15.10
$15.10 - $15.10
$15.10
Only 2 left!

Volvo Penta 3583830 is a genuine OEM O-ring used in Volvo Penta cooling-system service. Current fitment trails support this seal in compact Volvo P...

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$15.10 - $15.10
$15.10
$15.10 - $15.10
$15.10

PCM Pump-to-Thermostat Housing Elbow – R024002

$93.56 - $93.56
$93.56
$93.56 - $93.56
$93.56
Only 1 left!

he PCM R024002 is a genuine OEM pump-to-thermostat housing elbow used in Pleasurecraft Marine (PCM) fresh water cooling (FWC) systems. This compone...

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$93.56 - $93.56
$93.56
$93.56 - $93.56
$93.56

Volvo Penta Thermostat Housing Gasket – 1542123

$33.00 - $33.00
$33.00
$33.00
$33.00 - $33.00
$33.00
Only 1 left!

Product Title Volvo Penta Gasket 1542123 – OEM Marine Engine Thermostat Housing Gasket Product Description The Volvo Penta 1542123 Gasket i...

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$33.00 - $33.00
$33.00
$33.00
$33.00 - $33.00
$33.00

PCM Thermostat Kit 143°F – RP026002E

$78.62 - $78.62
$78.62
$78.62 - $78.62
$78.62
Only 1 left!

The PCM RP026002E Thermostat Kit is a genuine OEM 143°F raw water thermostat designed for Pleasurecraft Marine (PCM) Ford-based inboard engines. Th...

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$78.62 - $78.62
$78.62
$78.62 - $78.62
$78.62

PCM Thermostat Housing Gasket RM0004

$3.67 - $3.67
$3.67
$3.67
$3.67 - $3.67
$3.67
Only 1 left!

Prevent coolant leaks and maintain proper engine cooling with the PCM Thermostat Housing Gasket RM0004. This genuine Pleasurecraft Marine (PCM) OEM...

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$3.67 - $3.67
$3.67
$3.67
$3.67 - $3.67
$3.67

MerCruiser Thermostat Cover Housing – 8M0061068 (454 / 502 Big Block)

$162.84 - $162.84
$162.84
$162.84 - $162.84
$162.84
Only 1 left!

The Mercury / Quicksilver 8M0061068 Thermostat Cover Housing is a genuine OEM upper thermostat housing cover used on MerCruiser GM-based marine eng...

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$162.84 - $162.84
$162.84
$162.84 - $162.84
$162.84

Volvo Penta KAD42 KAD43 Thermostat Housing - 3583098

$0.00 - $0.00
$0.00
$242.00
$242.00 - $242.00
$242.00
Only 1 left!

The Volvo Penta 3583098 is a genuine Volvo Penta OEM thermostat housing used in select Volvo Penta marine diesel cooling systems. This housing form...

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$0.00 - $0.00
$0.00
$242.00
$242.00 - $242.00
$242.00

Yanmar Marine Engine Thermostat - OEM Cooling System Component

$128.70 - $128.70
$128.70
$128.70
$128.70 - $128.70
$128.70
Only 1 left!

OEM Thermostat for Yanmar Marine Engines This genuine Yanmar thermostat is designed for marine engines, regulating coolant temperature to maintain ...

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$128.70 - $128.70
$128.70
$128.70
$128.70 - $128.70
$128.70

Yanmar Thermostat Gasket 129150-49811 - Marine Diesel Engine

$3.59 - $3.59
$3.59
$3.59
$3.59 - $3.59
$3.59
Only 2 left!

Genuine Yanmar Thermostat Gasket - Professional Marine Engine Component OEM thermostat gasket designed for Yanmar marine diesel engines. Precision-...

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$3.59 - $3.59
$3.59
$3.59
$3.59 - $3.59
$3.59

Yanmar Thermostat Gasket 119773-49570 - Marine Diesel Engine

$6.98 - $6.98
$6.98
$6.98
$6.98 - $6.98
$6.98
Only 3 left!

Genuine Yanmar Thermostat Gasket - Professional Marine Engine Component OEM thermostat gasket designed for Yanmar marine diesel engines. Precision...

View full details
$6.98 - $6.98
$6.98
$6.98
$6.98 - $6.98
$6.98

Yanmar Thermostat 119773-49550 - 70°C Marine Diesel Engine

$157.22 - $157.22
$157.22
$157.22
$157.22 - $157.22
$157.22
Only 4 left!

Genuine Yanmar 70°C Thermostat - Professional Marine Diesel Engine Component OEM thermostat designed for Yanmar marine diesel engines with a 70°C ...

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$157.22 - $157.22
$157.22
$157.22
$157.22 - $157.22
$157.22

Yamaha Thermostat 6H3-12411-20-00 - Special Order

$0.00 - $0.00
$0.00
$96.89
$96.89 - $96.89
$96.89

The Yamaha 6H3-12411-20-00 is an OEM thermostat for select Yamaha two-stroke outboard cooling systems. It regulates engine operating temperature by...

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$0.00 - $0.00
$0.00
$96.89
$96.89 - $96.89
$96.89

Yamaha Outboard Thermostat – 6AW-12411-00-00

$89.47 - $89.47
$89.47
$89.47 - $89.47
$89.47
Only 2 left!

The Yamaha 6AW-12411-00-00 Thermostat is a genuine OEM cooling system component designed to regulate engine temperature in Yamaha outboard motors. ...

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$89.47 - $89.47
$89.47
$89.47 - $89.47
$89.47

Yamaha Thermostat Seal | 67F-12412-00-00

$14.70 - $14.70
$14.70
$14.70
$14.70 - $14.70
$14.70
Only 2 left!

Genuine Yamaha OEM thermostat seal designed to provide a reliable, leak-free seal in your marine engine's cooling system. This precision-engineered...

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$14.70 - $14.70
$14.70
$14.70
$14.70 - $14.70
$14.70

Yamaha Outboard Thermostat – 67F-12411-01-00

$73.54 - $73.54
$73.54
$73.54 - $73.54
$73.54
Only 2 left!

The Yamaha 67F-12411-01-00 Thermostat is a genuine OEM cooling system component designed to regulate engine temperature in Yamaha outboard motors. ...

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$73.54 - $73.54
$73.54
$73.54 - $73.54
$73.54

Sierra Marine Thermostat 18-43017 – Indmar S985009 / MerCruiser 8.1L 496 MAG Cooling System

$48.80 - $48.80
$48.80
$48.80
$48.80 - $48.80
$48.80
Only 1 left!

The Sierra 18-43017 Thermostat is a precision 160° temperature control thermostat designed for high-horsepower GM-based marine engines, including I...

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$48.80 - $48.80
$48.80
$48.80
$48.80 - $48.80
$48.80

Sierra 18-3552 Thermostat – Mercury MerCruiser Replacement

$41.12 - $41.12
$41.12
$41.12
$41.12 - $41.12
$41.12
Only 1 left!

The Sierra 18-3552 Thermostat is a high-quality aftermarket replacement designed for Mercury MerCruiser engines, providing reliable temperature reg...

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$41.12 - $41.12
$41.12
$41.12
$41.12 - $41.12
$41.12

Sierra 18-3549 Thermostat 120°F – Johnson Evinrude OMC Replacement

$45.52 - $45.52
$45.52
$45.52
$45.52 - $45.52
$45.52
Only 1 left!

The Sierra 18-3549 Thermostat (120°F) is a premium aftermarket replacement designed for Johnson, Evinrude, and OMC outboard engines. It regulates e...

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$45.52 - $45.52
$45.52
$45.52
$45.52 - $45.52
$45.52

Volvo Penta Thermostat Kit – 875580

$75.00 - $75.00
$75.00
$75.00
$75.00 - $75.00
$75.00
Only 1 left!

The Volvo Penta 875580 Thermostat Kit is a genuine OEM cooling system service kit designed to maintain proper engine operating temperature in Volvo...

View full details
$75.00 - $75.00
$75.00
$75.00
$75.00 - $75.00
$75.00

Volvo Penta Thermostat – 8149182

$191.00 - $191.00
$191.00
$191.00
$191.00 - $191.00
$191.00
Only 2 left!

The Volvo Penta 8149182 Thermostat is a genuine OEM cooling system component designed to regulate engine temperature in Volvo Penta marine diesel e...

View full details
$191.00 - $191.00
$191.00
$191.00
$191.00 - $191.00
$191.00

Volvo Penta Thermostat 3856961

$52.00 - $52.00
$52.00
$52.00
$52.00 - $52.00
$52.00
Only 5 left!

The Volvo Penta 3856961 Thermostat is a genuine OEM cooling system component designed to precisely regulate engine temperature in Volvo Penta marin...

View full details
$52.00 - $52.00
$52.00
$52.00
$52.00 - $52.00
$52.00

Volvo Penta Thermostat 3842015

$160.00 - $160.00
$160.00
$160.00
$160.00 - $160.00
$160.00
Only 1 left!

Volvo Penta 3842015 is a genuine OEM engine thermostat used in Volvo Penta compact marine diesel cooling systems. Current Volvo Penta dealer refere...

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$160.00 - $160.00
$160.00
$160.00
$160.00 - $160.00
$160.00

Volvo Penta Thermostat Kit – 3831424

$86.00 - $86.00
$86.00
$86.00
$86.00 - $86.00
$86.00
Only 2 left!

The Volvo Penta 3831424 Thermostat Kit is a genuine OEM cooling system service kit engineered to deliver precise thermal regulation and long-term r...

View full details
$86.00 - $86.00
$86.00
$86.00
$86.00 - $86.00
$86.00

Volvo Penta Thermostat 3587597

$42.40 - $42.40
$42.40
$42.40
$42.40 - $42.40
$42.40
Only 1 left!

The Volvo Penta 3587597 Thermostat is a genuine OEM cooling system component engineered to provide precise thermal regulation in Volvo Penta gasoli...

View full details
$42.40 - $42.40
$42.40
$42.40
$42.40 - $42.40
$42.40

Volvo Penta Thermostat – 21437904

$99.00 - $99.00
$99.00
$99.00
$99.00 - $99.00
$99.00
Only 2 left!

The Volvo Penta 21437904 Thermostat is a genuine OEM cooling system component engineered for precise temperature regulation in Volvo Penta marine e...

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$99.00 - $99.00
$99.00
$99.00
$99.00 - $99.00
$99.00

Volvo Penta Thermostat 82°C D5A D7A TAD 20450736

$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00
Only 1 left!

The Volvo Penta Thermostat 20450736 is a genuine OEM engine cooling thermostat used in compatible Volvo Penta D5/D7 and industrial engine cooling s...

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$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00

PCM Thermostat Housing Gasket RM0001

$1.78 - $1.78
$1.78
$1.78
$1.78 - $1.78
$1.78
Only 1 left!

Seal the thermostat housing and maintain proper engine cooling with the PCM Thermostat Housing Gasket RM0001. This genuine Pleasurecraft Marine (PC...

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$1.78 - $1.78
$1.78
$1.78
$1.78 - $1.78
$1.78

MerCruiser Thermostat – 991551

$62.69 - $62.69
$62.69
$62.69 - $62.69
$62.69
Only 2 left!

The Mercury MerCruiser 991551 Thermostat is a genuine OEM 160°F (71°C) thermostat designed for GM-based MerCruiser marine engines equipped with clo...

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$62.69 - $62.69
$62.69
$62.69 - $62.69
$62.69

Mercury Outboard Thermostat 140°F – 8M0162139

$198.83 - $198.83
$198.83
$198.83 - $198.83
$198.83
Only 3 left!

The Mercury / Quicksilver 8M0162139 Thermostat is a genuine OEM 140°F (60°C) thermostat designed for modern Mercury outboard engines. This thermost...

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$198.83 - $198.83
$198.83
$198.83 - $198.83
$198.83

Mercury Outboard 140°F Thermostat - 8M0119207

$0.00 - $0.00
$0.00
$127.27
$127.27 - $127.27
$127.27
Only 1 left!

The Mercury Quicksilver 8M0119207 is a genuine Mercury Marine OEM 140°F / 60°C thermostat used in select Mercury, Mariner, and SeaPro outboard cool...

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$0.00 - $0.00
$0.00
$127.27
$127.27 - $127.27
$127.27

Mercury Outboard Thermostat 120°F – 8M0117413

$40.95 - $40.95
$40.95
$40.95 - $40.95
$40.95
Only 1 left!

The Mercury / Quicksilver 8M0117413 Thermostat is a genuine OEM 120°F (48.8°C) thermostat used on small-to-mid horsepower Mercury 4-stroke outboard...

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$40.95 - $40.95
$40.95
$40.95 - $40.95
$40.95

Mercury MerCruiser 160°F Thermostat - 8M0109441

$0.00 - $0.00
$0.00
$53.19
$53.19 - $53.19
$53.19
Only 2 left!

The Mercury MerCruiser Quicksilver 8M0109441 is a genuine Mercury Marine OEM 160°F thermostat used in select MerCruiser sterndrive, inboard, and Me...

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$53.19
$53.19 - $53.19
$53.19