Gone are the days of trashing your 1 lb propane bottles to buy new full ones. With this adapter, you can refill your 1 lb bottles from a 20 to 30 lb bottle typically used for gas grills, etc. To maximize filling, you can put an empty 1 lb bottle in a fridge or freezer for several minutes before filling. This will help any residual gasses to condense to liquid allowing more free space for new gas vapor to enter the bottle. An ultimate propane adapter built with the intention of reducing the cost of resources used. Suitable for camping, tailgating, heating needs, cooking outdoors, and much more.