Sierra 18-43015 Thermostat
Sierra 18-43015 Thermostat, Sierra 18-43015 Mercruiser ThermostatSierra replacement thermostat for Mercruiser Stern Drives.Fits: MCM 4.3L, 5.0L, 5.7L & 6.2L MPI engines w/dry joint exhaust & closed cooling Temperature Rating: 170F (77C); Interchangeable with: Mallory; 9-43015; Mercruiser Stern Drive; 864493;