BTS 11.1 Litre 207 Bar Natural MES Aluminium Cylinder with M26 Valve & 2nd Outlet S16816639 11.1 Litre - 80 Cubic Feet 207 Bar MES Natural 'Dirty Beast Aluminium Cylinder complete with Left Handed M26 Nitrox Outlet Valve with Second Outlet 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.