BTS 18 Litre 230 Bar DIN Steel Cylinder Twin Set with Isolation Manifold & Bands S16116690 18 Litre ECS - Eurocylinder 230 Bar White 'DIR Style' Steel Cylinder Twin Set complete with Stainless Steel Twinning Bands with Nuts & Bolts to allow assembly on to a Tech Wing Harness or B.C.D. & 230 Bar G5/8 DIN Outlet Twin Manifold with Central Isolation Valve for use with Regulator 1st Stages with Standard Male 230 Bar DIN Thread, which can be easily converted for use with INT - A Clamp Regulators with an optional DIN Insert. For use with normal Breathing Air, all O-Rings are Viton ready for O2 cleaning for use with Nitrox. Each Cylinder Measures 740mm in length with a Diameter of 204mm, weighs 26.01 Kgs plus Valve, buoyancy of -3.02 Kgs in Sea Water & -4.95 Kgs in Fresh Water when Fully Charged.