Heavy Duty Polymer cylinder boot for safe upright storage & protection of most 10 and 12 Litre single SCUBA diving or Air Gun cylinders with a rounded base and diameter between 171 and 178mm. Our top quality cylinder boots are especially produced in the EU from high specification polymer compound to protect the base of your cylinders and assist in extending the life of expensive air tanks. Beaver’s cylinder Boots also have vents with ribs and drain holes to allow water to drain away freely to help prevent corrosion.