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3" diameter oxygen regulator as used in WW2 aircraft
like the P-51 fighter. These have 1950s dates but
are same type as WW2. Pilot would connect his
oxygen mask hose to the large, 1 inch diameter
connector. He flew with the regulator in the normal
oxygen mode(see picture). When he needed 100%
oxygen, for combat, he would either flick the lever
to 100% oxygen or open the red valve ( see picture).
After combat, he would go back to diluted or regular
oxygen flow to conserve his oxygen. I used to sell
these for $250.00 ea., in overhauled condition.
These are in AS Removed condition, NOT FOR FLIGHT.
Makes a great mantle or shelf piece for the pilot or
ww2 enthusiast or aircraft instrument collector.