This is a replacement lid for either the 5.3 gallon (20L) or the 7.9 gallon (30L) Speidel plastic fermenters. These lids are German engineered and quite durable. However, your dog Hershey may mistake this for a frisbee or a robber (he's a good boy, but not too bright...) and you might find yourself in need of a replacement. Never fear! Whether your lid gets chewed by the dog or lost in a move, we've got you covered!