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"The HomeFill system allows you to easily fill your own portable cylinders right in your own home. You will save money in the long run in a few different ways \u2013 in energy costs, battery costs (if you would have gotten a portable oxygen concentrator), and in oxygen delivery costs. You will love being able to fill your own oxygen cylinders at your leisure.\r\n\r\nThe HomeFill is compatible with the HomeFill cylinders, which come in the the sizes of M2, ML4, ML6 and ML9. These sizes range from the lowest capacity of 57 Liters (M2), to 255 Liters (ML9), as well as the others in between. \r\n\r\nThese cylinders fit easily into the compressor when you are ready to refill them, and the machine will stop filling when it is full. The HomeFill is a smart machine, and won't overfill or cause any dangerous oxygen leaks. \r\n\r\nThe HomeFill compressor itself weighs 33 lbs, and you won't need to worry about moving it around much, as it is essentially a stationary oxygen concentrator. Unlike most stationary oxygen concentrators, however, you won't need to run it for very long to get the amount of oxygen you will need. For example, the ML4 takes just 55 to fill up to 113 liters, and will last for 55 minutes.\r\n\r\nThe HomeFill compressor is relatively small for how powerful it is. It sits at 20.25 inches wide, 15 inches tall and 16 inches deep, so you can easily set it up on a tabletop to use, or store it inside a cabinet when you're done. \r\n\r\nHere is a  complete list of Invacare HomeFill Oxygen Compressor specifications and features."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.oxygenconcentratorstore.com/invacare-homefill-compressor/>