We offer the industry standard metal re-enforced Sight Glass for Home Brewing, as well as economy versions, both come complete with a 1/2" NPT Adapter. They are designed to show the volume of liquid in your brewing vessels. Widely used in hot liquor tanks to check water levels, they are also useful in boil kettles to check before and after boil volume levels. These Brewing Sight Gauge's can be converted to a weldless sight glass using a Weldless Kit. We also offer the Tri-Clamp Sight Glass that is widely used in Breweries and more recently with home brewers.