You will need the Flame King Propane Refill Adapter, sold separately or as part of the Flame King 1 lb Cylinder plus Refill Kit bundle. Invert your 20 lb propane tank, connect it to the adapter, then connect the adapter to your 1 lb cylinder. The 90-degree bent tube is designed to keep the smaller cylinder upright for safe filling. The EZ lever automatically cuts off propane flow when released. Always refill outdoors, check for leaks with soapy water before use, and only refill DOT-certified Flame King refillable cylinders, never standard disposables.