Self-draining tank boots protect boat decks, pool tiles, and the bottom finish of tanks and enable the cylinder to stand upright. Drainage ribs on the inside surface of the boot allow corrosive water to drain away. Our tough rubber/plastic alloy resists cold water cracking and will not mark pool decks. The octagonal rim helps to prevent tank rolling. Sizes available for 6.9 or 8-inch round bottom and 6.9 or 7.25 flat bottom tanks.