The Kegco MK-K5G-DDI Keg is a sixth barrel keg made entirely of food/beverage grade AISI 304 stainless steel. In addition to holding up to 5 US Gallons of beer, they are ideal for fermenting, kegging, storing and dispensing kombucha. They come with a Micromatic D System Sanke valve already installed. All seams have been TIG machine welded for smooth and consistent seams with no burn residue. They have fully rolled top and bottom stainless steel chimes. All surfaces of the keg have been pickled (chemically descaled) and fully passivated for a clean, sanitary and corrosive free surface. Used by breweries all over the world, these kegs are an excellent choice for your professional brewery operation.Please Note: Commercial kegs are intended to be used by professional breweries that have the specialized equipment to properly clean and sanitize these style kegs. These kegs are not recommended for use by home brewers who want to dispense beer using a commercial keg. There is no way to effectively clean and sanitize them without specialized equipment. We will not accept returns on these kegs purchased for home or personal use. Drop-in style valves are installed by dropping the valve into the key-way notches located near the upper edge of the keg neck. Once in place a stainless, spiral, two-layer thick, retaining ring is installed into the upper groove of the keg neck. This holds the valve in position and prevents tampering. Drop-in valves require a specific o-rings (not lathe-cut gaskets) according to the valve design model.