Made to fit our Sertodo Copper Water Filtration systems and Niagara Water Dispensers. You can monitor your water level without having to remove the upper water filtration vessel. This spigot has a solid stainless steel body, lever, and tube housing. The site tube itself is made from glass and contains a small red ball that allows you to quickly and easily see the water level in your system. No more guessing and NO MORE OVERFLOWING Water Reservoirs! You'll easily be able to see the water level inside your copper tank to determine how much water to add to the filtration vessel to top off your water! 7 inch tall site tube.