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Hi All, I made this thing to control the flow of oxygen instantly so I don't let it waste away when I'm breathing out. So everytime I breath in, I press the trigger. It releases oxygen. Then while I hold the oxygen in I can let go of the trigger and tank will stop. So it doesn't keep flowing for nothing. It will save me by 50% if the tank and therefore each tank will last longer. I could have found a smaller press valve or switch, but I found this to be working so effectively and just a slight squeeze of a trigger. Note that the pipe from the tank to the gun must be thicker for obvious reasons. Also I know this tank is miniature. Cycle just begun, so my big tank is arriving today. Just an idea I thought off that might help others. Probably others came up with this too. But anyways. Costed me R30 here in SA which should be about 2 dollars. I can't upload a video to show it working cos of the size of the file. But I think you get the idea. Pain free wishes to all. Snowflake

I like what you did with the valve!!! My daughter also has one (store-bought) and she loves it, so I'm not knocking it. But this is a question I have to keep asking. If you have the proper kind of mask (a non-rebreather with a reservoir bag that holds the oxygen until you're ready to breathe it), which looks like what you have from the photo, you're not losing the O2 that comes in while you have inhaled and are holding it in -- that's the O2 that you use for your next inhale. It's the same O2, and roughly the same amount, that you get when you pull the trigger. You might be saving some O2, but I would say that it's far from 50%. I would love to be clearly corrected if I'm wrong about this. My belief is that whether you inhale from the bag or on demand, you are still using roughly the same amount of O2, except for what might be lost from some kind of leakage in the non-demand system.