I bought a Mountain High O2-D1 flowmeter last year as a replacement for a personal one that had gone missing. I used it one time, then found my old one. It has all the parts that come with this unit (cannula, mask, bag, etc..) BUT NO TANK REGULATOR and is ready to go. Since I bought it Mountain High has come out with a newer model that has a rotary switch on it -- this does not have the rotary switch. Many of us have used the previous model for years with no problem and I don't think this is a drawback. This has been used exactly one flight.

I'd like $625 for it, shipped to you. Send a personal email if you want it: fred DOT lasor AT gmail DOT com.