The New Improved all Stainless and Glass Berkey Sight Glass.
 
This snazzy new water level indicator is a handy addition to your Berkey. It takes the guess work out of how much water is left in your system.
 
They come in a range of sizes for different the different models.
 
Travel Berkey and Big Berkey units use the 7"
Royal Berkey uses the 10"
Imperial and Crown Berkey uses the 13"
 
The Sight glass is sealed with silicone washers and looks great as well as being functional. They are particularly handy for the larger Imperial and Crown Berkey models that are too cumbersome to look inside.