This Ss Brewtech Mash Re - Circulation Manifold is perfect for homebrewers and small - scale commercial brewers. You can use it when you're brewing beer in your Ss Brewtech 10 - 30 gallon kettles or mash tuns. It has a diameter of 12.6 inches and is made of 304 stainless steel. The 3/8' hose barb inlet allows for easy connection to other brewing equipment.