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Could be a magnet that floats in a channel , triggering a switch on the outside of the box.
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Not necessarily. Might be a tube with a floaty thing on it. Alternatively it could be a capacitive switch with metal contacts on the wall of the water chamber - the capacity will change if they're covered by water rather than air.
If none of the above then magnets.
Howard
Brommers
@moocher
which would presumably need to be inside or dangling into the big long water collection box?
i see no such thing