Variable capacity stainless-steel tank can accommodate batch sizes from 1 To 12 gallons. Its lid seals, air-Tight against the inside wall of the tank with the aid of a inflatable gasket. Think of it as a food-grade, bicycle inner-tube placed around the outer edge of the lid. Just position the lid to the appropriate height for your batch and then inflate the tube with the hand-pump that is provided. You can put lid as close, or as far away from the liquid's surface as you like.Designed for fermentations: the variable capacity tank can be used for both primary and secondary fermentations and works just as well for beer as it does wine. Its lid is fitted with a dry air-lock that allows gases to escape while keeping the tank sealed air-tight. It comes equipped with a heavy-duty, ball-valve faucet for easily transferring your wine or beer to a second container or for bottling. Quality craftsmanship: the variable capacity tank is a professional piece ofwine making equipment. It is manufactured by Prettech, a recognized world leader of winery equipment since 1971. These are the same brand of tanks that are used by professional wineries around the world. The tanks are made of heavy-gauge, 304 stainless steel with a beautiful, polished-marble finish.Details:commercial-grade construction. Made of heavy-gauge, 304 stainless steel with polished-marble finish. Lid can be set to any height to accommodate batches from 1 To 12 gallons. Can be used for both primary and secondary fermentations. Lid is fitted with high-volume, dry air-lock. Has a chrome-plated, ball-valve faucet for easy transferring or bottling. Has fill-level markings in liter increments.