lauter tun

A lauter tun is a special container used in all-grain brewing for separating the sweet wort from the spent grains (malted barley etc.). In essence it is simply a large strainer. It can be as simple as a plastic bucket with holes in the bottom or as complex as a stainless steel kettle with a specialized straining device attached to a spigot welded into the side of the kettle.
See more at Wikipedia.org...