Quicksilver thermostat 8M6010302 is for use on select 6-55hp Evinrude, Johnson, OMC, 2-cycle outboards, V4 and V6 Crossflow outboards. This 143°F Quicksilver thermostat is designed to meet all OEM specifications. See your owner's or service manual for specific application and installation information. Hardware, gaskets or seals for installation sold separately. This Quicksilver thermostat replaces the following OEM part numbers: 434841, 378065, 393659. Also can be found in the aftermarket as 18-3553.