I got 2 M-15's from Jack at unlimitedoxygen in July for $350 each and I wish I had gotten them 3 years sooner. They run my barracuda very well. I broke one of the green screw thingy's that connect the tubing to the concentrator and Jack Priority-Mailed me a new one and 2 spares, free of charge. He also sent the hoses and y-adaptor along with the concentrators. I recommend his products and service.
Kelly
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