This Sierra Boat Thermostat 18-3549 is a must-have for any boat owner who wants to ensure their engine is running at optimal temperatures. With its high-quality construction and reliable performance, this thermostat is the perfect addition to any boat's engine. Crafted by Sierra, a trusted brand in the industry, this thermostat is designed to fit a wide range of boats and provide precise temperature regulation. It features a manufacturer part number of 18-3549 and is suitable for use in a variety of marine applications. Whether you're cruising at high speeds or trolling for fish, this thermostat will help keep your engine running smoothly. Box 723