BTS 5.7 Litre 207 Bar Natural Luxfer Aluminium Cylinder with Rebreather Valve S16416692 5.7 Litre - 40 Cubic Feet 207 Bar Luxfer Natural 'Dirty Beast Aluminium Cylinder Cylinder complete with 230 Bar G5/8 DIN Outlet Rebreather Valve with Viton O-Rings, for use with normal Breathing Air. Cylinder Measures 628mm in length with a Diameter of 133mm, weighs 8.63 Kgs plus Valve, buoyancy of +0.09 Kgs in Sea Water & -0.66 Kgs in Fresh Water when Fully Charged.