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Sierra Marine Thermostats

5.0 out of 5 stars 5 Customer Reviews

Sierra Marine thermostats are exact replacements made of the same high-quality materials as your factory original to provide accurate fit and function for reliable performance. They are available in a wide range of make/model and engine applications—order the thermostat model suited to your needs.

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Sierra Marine Thermostats 18-3550

Sierra Marine Thermostats 18-3550

Sierra Marine Thermostats 18-3550

Thermostat, 140 Degree, Mercruiser, Mercury Marine, Chrysler, Each

Part Number: RRA-18-3550

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

Sierra Marine Thermostats 18-3672

Sierra Marine Thermostats 18-3672

Sierra Marine Thermostats 18-3672

Thermostat, Gasket, Outboard, Copper/Brass, Mercury Marine, Kit

Part Number: RRA-18-3672

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

Sierra Marine Thermostats 18-3673

Sierra Marine Thermostats 18-3673

Sierra Marine Thermostats 18-3673

Thermostat, Gaskets, Springs, Outboard, Johnson/Evinrude, Kit

Part Number: RRA-18-3673

Not Yet Reviewed

Estimated Ship Date: Dec 22, 2025 if ordered today

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Estimated Ship Date: Dec 22, 2025 if ordered today

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This is a custom order part. You can order this part by Contacting Us.