5.5" Twin Cylinder Boot - HS CODE - 3926909790  C.O.O. - EU Heavy Duty Polymer twin cylinder boot for safe upright storage & protection of most 5 and 7 Litre double SCUBA diving or Air Gun cylinder sets with a rounded base and diameter of approximately 140mm and centre to centre of the cylinders of approximately 15cm. 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 twin 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.