A versatile solution to patients' oxygen needs, Cyl-Fil offers a convenient, low-cost alternative to cylinder delivery methods and home fill systems. Cyl-Fil significantly reduces the need for monthly cylinder deliveries (up to 75%) and virtually eliminates emergency deliveries. Oxygen expense is lowered by almost 80% - patients fill and refill their own ambulatory cylinders at home, instead of requesting additional. Cyl-Fil is simple to use - open and close two valves to begin filling. The system automatically regulates the cylinder refilling to approximately 15 minutes. The built-in regulator offers continuous flow settings for in-home emergency use.