The DAN Charter Boat Unit is designed to be used on lager built-in oxygen cylinders aboard charter boats and other vessels. These vessels require a larger supply of oxygen for an extended periods of oxygen treatment. This unit comes with a first stage CGA-540 Regulator and Demand Valve w/6 foot green hose. Case size: 10.7"x 9.7"x 6.8", 2.8 lbs.(Manufacturers Lifetime Warranty and has the highest international manufacturing quality certification. Made in the USA)