Lumb Bros 3L Pony Cylinder Boot 3L Pony Cylinder Boot suitable for Scuba Diving Tanks / Cylinders with a 4\" or 100mm diameter. Moulded from sturdy rubber with a flat base, the pony boot also has a ribbed inside and drain holes to facilitate water drainage to help prevent corrosion. Tip: Remove cylinder boots every 3 months and wash the base of the cylinder and the boot to prevent unwanted corrosion. Features: Stop your bottle falling over - This rubber boot simply pushes on to the the bottom of your cylinder and gives a flat base to help prevent the bottle from falling over. Protect the base of your cylinders - The flat bottoms allow the cylinders to stand upright and are vented with ribs and drain holes to allow water to drain away to help prevent corrosion. Designed fit perfectly over the bottom of your steel diving cylinder, providing superb impact protection and improved stability, when back on dry land. Manufactured from a high grade rubber compound. Sizing: Diving Cylinder Capacity ltr Diameter mm Height mm Tare weight kg 3 100 580 4 7 140 685 8 10 177 635 11.2 12 177 750 13.6 12 203 622 13.7 15 203 724 16.9