He was the 4th or 5th plumber we had out, to find out why our kitchen sink wasn’t draining. Besides checking out the drainpipes under the sink he took our suggestion and cleaned out the vent, also replacing the old(1951) kitchen drain, which wasn’t to code. He was frustrated with his lack of progress but«soldiered on» until he found out what the problem was. If we could give him 10 stars we would.