BTS 1.8 Litre 230 Bar Black Steel Cylinder with Top Handled M26 Valve S16716669 1.8 Litre 230 Bar ECS - Eurocylinder Black Steel Cylinder complete with M18 Top Handled 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 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.