I bought two of these "143 degree thermostats" for my two engine boat. The only problem is they won't open until it's much, much hotter. I tested them in a pot of hot water after my engines turned red on the temp gauges. The thermometer I used for testing showed a maximum temperature of 190 degrees and the thermostat only opened after that. I don't know the exact temperature but it must have been over 200 degrees because the thermostats had gas bubbles in the water before they opened.
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