Why accordion-style flexible drain pipe is against code

flexible drain pipe
An example of a flexible coupling

From time to time I see accordion-style flexible drain pipe (also sometimes called flexible waste pipe) in use, much like the one on the right. St. Louis County inspectors take an exceptionally dim view of these, and I always wondered what the big deal was, since literally every hardware and home-improvement store in St. Louis County sells them. Why would they sell something if it isn’t okay to use it? Read more

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