BTS 11.1 Litre 207 Bar Natural MES Aluminium Cylinder with M26 Valve S16816636 11.1 Litre - 80 Cubic Feet 207 Bar MES Natural 'Dirty Beast Aluminium Cylinder complete with  M26 Nitrox Outlet Valve. For use with Nitox Regulator 1st Stages with M26 Male Thread. All O-Rings are Viton ready for O2 cleaning for use with Nitrox. Cylinder Measures 655mm in length with a Diameter of 184mm, weighs 16.78 Kgs plus Valve, buoyancy of +0.39 Kgs in Sea Water & -1.08 Kgs in Fresh Water when Fully Charged.