BTS 3 Litre 232 Bar Black Luxfer Aluminium Cylinder with Nitrox Rebreather Valve S16216510 3 Litre 232 Bar Black Luxfer Aluminium Cylinder complete with Nitrox 230 Bar G5/8 DIN Outlet Rebreather Valve. All O-Rings are Viton ready for O2 cleaning for use with Nitrox. Cylinder Measures 515mm in length with a Diameter of 111mm, weighs 5.34 Kgs plus Valve, buoyancy of -0.66 Kgs in Sea Water & -1.08 Kgs in Fresh Water when fully Charged.