Sierra International 18-3552 160 Degree Marine Thermostat for Mercruiser Stern Drive Sierra Needle and Seat Meets or exceeds the original equipment quality Sierra part number: 18-7094 Interchangeable with the following: GLM 40720, Evinrude/Johnson 379313, 396522, Mallory 9-36800 Fit specific, check part numbers to ensure proper fit