120 Degree Thermostat | Sierra 18-3549

Aftermarket thermostat used on many different Mercury and Mariner outboard motors.

• Fits Mercury 6 HP, 8 HP, and 9.9 HP 2 cylinder outboard engines from serial number A197112 and later
• Fits Mercury and Mariner Sea Pro 10 outboard engines from serial number D038000 and later
• Fits Mercury and Mariner 18XD, 20XD, and 25XD outboard engines from serial number B114231 and later
• Fits Mercury and Mariner 25 Sea Pro 2 cylinder outboard engines from serial number B238464 and later
• Fits Mercury and Mariner 30 HP 2 cylinder outboard engines from serial number G055314 and later
• Fits Mercury and Mariner 45 Jet, 50 HP, 55 HP, and 60 HP 3 cylinder from serial number G290585 and later
• Replaces Mercury 14586
• Replaces Mallory 9-43014