These are useful if you hate dust like me... but do yourself (and your wet-dry vac) a favor and get internal filter bags. Otherwise you will clog that vac filter up really fast
Set up your wet/dry vac like a water bong, putting a snorkel on the intake so it goes down into water in the canister before coming out and going through the filter.
^ Just get some PVC pipe and an elbow, cut a short length to make an upside down "L" shape, friction fitting it into the intake hole with o-rings, or wrap neophrene or rubber sheeting, etc around it for an air-tight, friction fit. Depends a bit on the specific vac, in some cases if the intake does not have a deep enough round area then you might have to bolt it on there with a flat or curved gasket.
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Thank you!