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In the 2nd pic, that yellow thing to the left is an auto-cutoff feature. The foam raises with water level and turns it off before overflow.
In the 4th pic, that disc can be pushed out to provide access to the water tube if you wish to re-route outside the observatory (5th pic).
The only caveat - a small modification is required to run the unit on a timer. Normally, you would have to manually press the 'on/off' button (1st pic). As said before, we use a timer to automate dew removal. A small soldering job fixes this and means that when the timer powers the unit, the unit turns on without user interaction. A simple 5min soldering job, easily reversable and does not damage the unit.
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