The steak Saver allows you to screw a standard, 1 lb. propane cylinder onto your gas grill, and with no time lost you're ready to continue grilling. It also lets you hook up your gas grill to the gas system on your RV in case you have an unexpected outage. These are the same one-pound tanks that are available in all stores and home center. In fact, you may even have one or two of these tanks in your home garage as part of your soldering torch kit. Then, the following day, you can bring your tank in to have it refilled, when it is convenient for you - not when you have to.