The Stainless 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" hole in your kettle. This sight gauge features our new Fermentap Bulkhead, which is a beefy bulkhead with a full port hole. This means that you can actually upgrade this setup with a thermometer which will thread into the body, allowing you to check temperature and fluid level off the same upgrade!