25LPM Oxygen Regulator CGA-540, Adjustable Flow 0-25 LPM - ASTM G175-03 - Aluminum/Brass, Max Inlet: 3000 PSI, Outlet: 50 PSI - Compact 1.38 inches X 6.29 inches

Needed a second O2 regulator to leave at the cabin. Mountain air is thin so this was perfect!

Works fine, does what it's supposed to. It's sized correctly and decently well machined. It's a good price and is as nicely made as it needs to be. Simple part so there's not too much else to say about it.

I am not using this for medical purposes. I just wanted a cheap option for controlling air flow when I put oxygen into aquarium fish bags. For that purpose it works fine. I like that it is affordable.

Cheap China garbage!! Gauge shows 1400 PSI when I received it. (not hooked to tank). This is scary if you were think you had 1400 PSI and the tank was empty. Sent back. Very dissappointed