Those unknown holes will get you in trouble.

I stuck a screwdriver in the disposer opening once to find the knock out had been removed, but it was clogged up with enough texture and paint material that it wouldn't even leak.

It leaked very well after I poked my screwdriver through it.

Painters. Gotta love them.

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Rick Hurst_Home Works Inspection Co_Rockwall TX
In the words of Mike Tyson.... "Everyone has a plan until they get hit inda mouf"