In slow cookings, it is necessary to cover the thermical bath to avoid excessive evaporation. Our watertight covers allow to increase the water heating speed, avoid evaporation and heat loss and stabilize your bath's temperature. Their design allows to free the excessive heat due to the pressure, keeping the steam away from the thermostat. They also protect the thermostat's electronics from the steam. In this way, your machine will always be cool, thus increasing its life and performance.