Thermostat kit 40HP (3-Cyl)

Get your boat back up and running with this OEM replacement thermostat kit Mercury 30-40 hp engines. Made with corrosion-resistant stainless steel, this kit offers increased service life and a self-cleaning design to flush out cooling system contaminants. Simply follow your owner's manual for easy, tool-free installation. Keep your boat's engine running at optimal temperature with this calibrated kit.

For 30-40HP 3-Cylinder engines with serial number: 1C456300  and above