Upgrade your Travel Berkey or Big Berkey System with this Berkey 7.5-Inch Sight Glass Spigot, which shows the remaining water level in the system's lower chamber so you can easily see when it’s time to refill your Berkey system. The Berkey Sight Glass Spigot also shows how much water you can safely add without overfilling your system, preventing unwanted spills. Replaces the standard black plastic spigot included with Berkey stainless steel systems. Spigot is easy to install, and can be easily cleaned with soap and water. Includes sight glass spigot, two washers and wing nut.