I don't think my canister has a switch in it. It is flat on top and if I blow into it, it takes air and not plugged. One person mentioned if running all the time, it would create too much vacuum for the tank and cause a problem. Not sure if that can happen with the stand pipes. Maybe they allow enough source for excess vacuum so as not to suck the tank in. I thought the stand pipe would allow atmospheric air pressures to fill the tank as needed.?
400 Lemans, thank you for that insight.
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