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should I just buy the test balls? Thanks Darren, and others. This is very helpful. One of the pains in the neck, which I'm sure you're aware of, is the fact that the average but experienced do-it-yourselfer like me doesn't own a nice set of test balls. For the first air test, I rented the...

I'm installing a half-bath (toilet, sink) on my second floor. I'm doing the work myself. Right after the rough-in was finished, the city inspector came in to inspect. At that point, I had to perform an air pressure test on the new lines. (Plug up vents and drains with test balls, which was a...