SAVE MONEY: Refill 1-pound green propane cylinders directly from a standard 20-pound propane tank. A simple, effective, money-saving solution that eliminates the need for more expensive bottles.Well Made: High quality solid brass provides a secure andairtight connection between tanks for durability.Safer: Built-in safety features ensure you don't overfill smaller tanks. Well constructed and built to be heavier, bigger and safer. Automatically shuts off airflow when pressure is reached.EASY INSTALLATION:No additional tools required, easy to install, with handle for tightening. Fits all 1 lb Propane BBQ gas cylinders for easy and quick refilling. Great for camping and outdoor cooking.Bonus Tip: Storing an empty 1-pound cylinder in the refrigeratorfor a few hours will help you refill faster.installation method:1Close the valve on the BBQ propane tank.2Insert the nose tip of the adapter into the 20 to 50 lb BBQ propane 3tank fill connection.4Turn the adapter counterclockwise to make a tightfit.5Screw the 1 lb cylinder propane tank clockwise into the adapter.6Turn the grill upside down and open the grill valve.7You will start to hear the propane gas transfer into the 1 lb cylinder tank.8When a certain pressure is reached, the adapterwill automatically cut off the gas flow to avoid overfilling, so sit back and let it fill itself.9When the tank stops making noise, simply close the grill valve and remove the 1 lb propane cylinder tank.