eelnoraa
Contributor
I can tell you it is not a comforting thing to do. For one, the weight of the 2nd stage makes different top side, so you will have jaw fratigue. Secondly, since you mouth will be open, you will drool all over the place through the exhaust port of the 2nd stage. Why I know this, I have tried it on a few almost empty decode bottle before taking them to hydro, it is not how I want to be administered oxygen or any gas for that matter.