Sierra 18-3543 Johnson/Evinrude 143 ThermostatSierra high-quality engine parts are designed to meet OEM specifications. Temperature Rating: 143; Interchangeable with: Johnson/Evinrude Outboards; 393659; 434841; 378065; 508626; 5005440; 437414; EMP; 75-00403; For Use On Engine Models: 40-250 HP E-Tech; 6-55 HP; Cross V4 & V6; 9.9 HP 4-Stroke 1994-2001; 15 HP 4-Stroke 1994-2001;