The Keggle Brewing Weldless Sight Gauge features a glass sight gauge encased in a chrome-plated sheath. All metal parts in contact with the beer are 100% stainless steel, and the gasket is a high temp, food-grade material. You will need to drill a 1/2" hole in your kettle. This is a perfect fit for Keggles and Kettles when doing 10-gallon batches. The overall length is 18".