Here is the middle section of the episode, the one that contains the most plumbing and has the funniest parts.
This Stooge Short is a fan favorite and as of 2010 is the highest rated episode on IMDB. It is also Curly Howard’s favorite episode. The Stooges are on the run from the cops as they take off in a plumbing van. Curly and Larry fall out of the van and see the cop rapidly approaching. So they they do the only sensible thing and run into the house that just so happens to need plumbers. Mayhem ensues and the Stooges mess everything up. One of the most famous images is the one of Curly stuck in a maze of pipes.