Placed my bottle in the fwd baggage. Replaced my 413ltr aluminum bottle with a Luxfer carbon M22A 613ltr 3.3lb bottle. SAved ~6lbs in the front, which I needed to save. I cant deal with anymore nose weight that I already have.
Installed an MH quick release bulkhead fitting in the baggage, split the line with a simple tee, and put 2 MH quick release fittings on the panel.
Does not get much cleaner than this. It does mean the pax line runs over the roll bar (past your right shoulder) to the back. No big deal. I was too lazy to run the line through the spar web and under the seats.
This install allows me to install and turn the bottle on before flight. And use it or not with no O2 loss if I dont. These fittings have no loss of O2 when not in use. You do have to remember to turn it on though in the baggage before flight. I have a simple velcro strap holding it in, although I have enough **** down in the hole to keep it from moving around.
They(MH) do have cool electronic solenoids for this, but Im way too cheap for that. I always know before I launch if there is a potential for use.
The key to this system for me is to just drop the bottle in and connect. I so rarely use the bottle, I want it outta there 99% of the time.
You can see by the tank height that a much bigger bottle can fit in there, but this volume is way more than I ever use even on long flights with 2 people.
Key items for me... Light weight removable bottle with enough air for 2 at 20k' for hours, quick release, easy connection in the cockpit of canula lines.