BTS 7 Litre 200 Bar Natural Luxfer Aluminium Cylinder with Nitrox Rebreather Valve S16216514 7 Litre - 50 Cubic Feet 200 Bar Luxfer Natural 'Dirty Beast' Aluminium Cylinder Cylinder complete with Nitrox 230 Bar G5/8 DIN Outlet Rebreather Valve. For use with Nitrox Regualtor 1st Stages with Male M26 Connection Thread. Cylinder Measures 610mm in length with a Diameter of 152mm, weighs 10.69 Kgs plus Valve, buoyancy of +0.19 Kgs in Sea Water & -0.74 Kgs in Fresh Water when Fully Charged.