The shop vac I have, from the eighties, has a ball that floats, and shuts
off the air if the tank fills.

Do the new shop vacs have a motor that's isolated from the air flow?

Christopher A. Young
Learn more about Jesus
www.lds.org
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However, many (if not most) "shop vacs" ARE specifically made to suck not
only wet stuff but straight water. They do not pass intake air over the
motor like many household vacuums do. (The first 50 or so shop vacs on HD's
web site all say "Wet/Dry".)