Generac 0H41040222 2.4L Diesel Thermostat Gasket.
For thermostat, see here: Generac 0H41040239 2.4L Diesel Thermostat
Generac replacement parts will also usually fit the following Generac branded generators: Honeywell, Guardian, Siemens, Carrier, Watchdog, Centurion, Eaton & Bryant.
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