Sierra International 18-3638 Thermostat

Sierra’S 18-3638 Thermostat Is Designed For Use With Mercury/Mariner 2.5 Hp To 3.5 Hp (S/N 0R131842 & Up) And 4 Hp To 6 Hp (S/N 0R411838 & Up) Outboard Engines. Includes One Thermostat Per Package. It Is Interchangeable With Mercury Marine 804540. Each Sierra Product Meets Or Exceeds The Original Equipment Part It Replaces. Fit Specific, Check Part Numbers To Ensure Proper Fit.