BTS 5.7 Litre 207 Bar Natural Luxfer Aluminium Cylinder with M26 Valve S16416693 5.7 Litre - 40 Cubic Feet 207 Bar Luxfer 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 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.