Product Description
Allows instant reading of the water level in the lower chamber of your stainless steel Berkey System
Available in three sizes based on the system you own:
7.5" - For Travel Berkey System and Big Berkey System
10" - For Royal Berkey System and Imperial Berkey System 
13" - For Crown Berkey System (includes sight glass brace)
The glass tube of the spigot can be easily cleaned with soap and water as needed
Includes two washers and a wingnut
All systems come standard with a basic spigot; the sight glass spigot is an upgrade purchase
Constructed of high-quality materials and made in the USA