The 12" Sight Glass for Stills and Thumpers will help you visually see the actual liquid level in the vessel.
The easy to see and use sight glass will show you the volume of your still while it is in use. If you are worried about your thumper filling up during the run, this might be a solution for you.
This option can be added to:
6 gallon stills and larger sizes
6.6 gallon thumpers and larger sizes