Grundy Tank is a term adopted by the North American craft brewing industry for UK-built pub cellar tanks. These inexpensive, mass-produced tanks were fabricated in the 1950s and 1960s and have been utilized at almost every stage of the brewing process. The 8.5 barrel (10 hl) tanks were originally produced for directly dispensing carbonated beer from pub cellars but have also been utilized for fermentation, conditioning, and bright beer storage. Some brewpubs use them as serving tanks. They are now usually sized at 3.5 or 7 US barrels.

While the tanks have found widespread application throughout the UK and North America, they are not without their drawbacks. Among the most notable of these is the large, unwieldy clamp that secures the lid to the standard model; these have occasionally slipped, causing potentially dangerous accidents as the lid blows off under pressure.

“Grundys” have been described as “the Tin Lizzie,” “the Model T of tanks,” and many other epithets since many have been sold into the North American craft brewing industry since the early 1980s. Many Grundy tanks have been modified, sold, re-sold, modified some more, repaired (often many times) had faces painted on them, and been both feared and cursed by legions of labor-weary brewers.