Quote Originally Posted by Aggie
another risk, albeit small, is if any form or a oil or grease should hit the top of the cylinder at the connectrion. It can cause it to start a fire and explode. Helps to have had a brother in law who was a fireman.
You are thinking of the strict warnings on Oxygen bottles against allowing any oil or grease in or on the fittings or connections. A drop of oil in O2 at those pressures will ignite sponaneously and explosively. Fortunately we don't have to deal with that stuff in the darkroom.