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Your cart is empty.Sierra products are engineered to meet today’s high horsepower engine demands and stand up in the harsh marine environment. All Sierra products meet or exceed the original equipment part it replaces. Sierra supplies many OEM engine manufacturers and boat builders hundreds of quality parts every day
Luciano Monari Jose
Reviewed in the United States on May 12, 2025
very good quality
Sal
Reviewed in the United States on October 2, 2024
Perfect fit and operationGreat value.
Ali Garrido
Reviewed in the United States on June 21, 2023
Excelente reemplazo para el mercury optimax 3.0L 200hp
Brian Spangler
Reviewed in the United States on January 3, 2023
Works great
Santos L. Ortiz Jr.
Reviewed in the United States on June 14, 2019
What else can I they work as they should, motor gets up to temp without issues.
Customer
Reviewed in the United States on December 11, 2018
Installed on my 225 optimaxEverything went well
spectrout
Reviewed in the United States on September 24, 2017
Bought this to replace old thermostat in 2014 225 Mercury Pro XS. Everything fit well.
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