BTS 5.7 Litre 207 Bar Natural Luxfer Aluminium Cylinder with Left Hand M26 Valve & Blanking Plug S16416694 5.7 Litre - 40 Cubic Feet 207 Bar Luxfer Natural 'Dirty Beast Aluminium Cylinder complete with Left Handed M26 Nitrox Outlet Valve with Blanking Plug 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.