A new machine can easily cost over $1200. Why pay that when you can get a almost new for half the price?
Selling my almost new Devilbiss 525DS, 5 liter per minute oxygen concentrator because I have another.
Works perfectly. Extemely low hours. A troublefree, dependable machine. This model has the Invacare port, so you can fill O2 tanks with the Homefill unit.
Remember, just like car mileage, a concentrators hours of operation is a great indicator of condition. Mine only has 320 hours!