Sierra S18-3638 Mercury/Mariner Outboard Cooling-System Thermostat

The Thermostat - 18-3638 is a Sierra marine product for the application or purpose described below.

Product information

• Part#: S18-3638
• Fits: Mercury 2.5-3.5HP (0R131842 & Up), 4-6HP (0R411838 & Up)
• Mercury Marine - 804540

Before ordering

Please compare the listed specifications and part number with your existing component. If you need help confirming compatibility, contact Jet Ski Parts Warehouse with your make, model, year and engine details.