I've been using my shop vac to clean out water features in the garden.
Never tried a sight glass, but I don't see why it wouldn't work.
I'm not sure how your shop vac works, but mine has a fan at the top that
blows air OUT of the vac - the resulting pressure difference is what
causes the vac to "suck". If I tried to run it without the bucket part,
there wouldn't be anything to exhaust air from, and no suction.
My vac has a drain cap on the side, at the bottom. I've set it up with
a hose that runs to a drainage ditch. If I try to run the vac with the
drainhose open, it just pulls air in thru the drain. I solved that by
installing a checkvalve so that when the vac is on, the valve seals and
the vac pulls thru the main hose. When the vac is off, the water inside
the bucket pushes the checkvalve open, and it drains out the bottom hose.
I just run it a few minutes to vacuum up gunk from the bottom of the
ponds, then turn the vac off for a few minutes to let the water drain out
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