Sierra 18-3631 Verado Thermostat With Housing
- Brand:
- Sierra
- Part no:
- 18-3631
Where to buy
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The Sierra 18-3631 is a replacement thermostat with its housing, made for Mercury Marine engines. It is listed to fit 135-300 Verado engines and carries a temperature rating of 144°F. Thermostat and housing are supplied together, so the housing does not need to be sourced separately. Compare the part number and your engine range before choosing it.
Our take
Because the housing is included with the 144°F thermostat, you replace both together instead of reusing an old housing. The fitment is stated as 135-300 Verado, so it is a part to match by engine range.