The Crathco 290-00006 Bowl Gasket is an OEM replacement part for the Crathco C-Series Simplicity Bubblers that help to prevent leaks; simply place in between the base and the container. This bowl gasket measures 1.2 inches in height by 5.8 inches in width by 6.2 inches in length. Although sold individually, it is always a good idea to have a spare Bowl Gasket on hand for a quick replacement, should the need arise.