Here tis. It's an air pump with a built in valve. I use it now for water circulation in my water aging tank. Was my moms but to be conservative I'd guess it's about 55 years old or so.
Q
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I have a tank from about 1940 in use, but a number of items in my collection of old aquarium equipment date back to 1890-1940, as well as lots from 1940-1975.
That's sweet, Toirtis. Any chance of pics of the circa 1940 tank?