On Mar 23, 8:03*pm, Eric Greenwell wrote:
Nine Bravo Ground wrote:

* * invent/devise/whatever a cable/lever/remote electric valve that lets
you open the bottle while flying. I used bicycle cable to a simple
bolt-on lever to the oxygen knob on the bottle in my Libelle. Easy - it
only has to be cracked less than a quarter turn. My other four gliders
had the bottle where a determined pilot could reach back to the baggage
area or beside himself and turn it on.

A couple of points

Mountain High has a clever remote valve operating device for their
cylinders.

Some older oxygen cylinder valves may leak past the stem if not fully
opened. I open O2 valves fully to seat the stem seal.