BTS 1.8 Litre 230 Bar Black Steel Cylinder with Nitrox Rebreather Valve S16716677 1.8 Litre 230 Bar ECS - Eurocylinder Black Steel 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 450mm in length with a Diameter of 83mm, weighs 3.2 Kgs plus Valve, buoyancy of -1.05 Kgs in Sea Water & -1.26 Kgs in Fresh Water when Fully Charged.