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Review on Sierra International 18 3556 Thermostat 130° by David Gibbs

Revainrating 5 out of 5

Works perfectly! best replacement parts

I recently bought a boat with a 1997 Mercury Force 40hp engine. Not knowing if the thermostat had ever been changed I decided to replace it as a preventive measure, it fit perfectly and was in the right temperature range, now I'm sure the old thermostat didn't overheat the engine.

Pros
  • Size: 3/4 inch or 19.1mm
Cons
  • Cable is shorter than others