Vintage Double Hose

This is from a very early Mar-Mac catalog. I think it shows pre-USD or Hope-Paige non return mouthpiece valves.....In the ad it looks like they are being put into an early one piece mouthpiece assembly. It is a large photo so give it time to load when you double click on it. I tried to make it large enough to see the detail. A friend of the forum sent it to me.

Just what every "Lunger" needs .

I thought that term was from Doc Holiday being a "Lunger"?


What was the diameter of those?

Nemrod