BTS 1 Litre 200 Bar Steel Cylinder with Inert Gas Valve 1st Stage, OPV & Backplate Mounting Straps S20999907 1 Litre  ECS - Eurocylinder 230 Bar Steel Cylinder with W21.8 Inert Gas Valve, 1st Stage, OPV & Backplate Mounting Straps Package. Cylinder with Male W21.8 Inert Gas Outlet Valve for use with Inert Gases such as Argon used for Dry Suit Inflation to provide additional warmth. Female W21.8 Inert Gas Mini First Stage with Integral Over Pressure Relief Valve, 1 High Pressure 7/16� UNF for attachment of Pressure Contents Gauge & 1 additional Low Pressure 3/8� UNF Outlet for attachment of Inflation Hose & Thread Protection Cap. Pair of 50mm � 2 Inch Webbing Tech Harness Mounting Straps with Cylinder Grip Pads, Stainless Steel Nuts & Bolts & Pair of Fitting Tools. Cylinder Measures 265mm in length with a Diameter of 83mm, weighs 1.94 Kgs plus Valve & Backplate Straps, buoyancy of -0.85 Kgs in Sea Water & -0.96 Kgs in Fresh Water when Fully Charged.