There is so much builder cr-p that needs to be fixed I'm convinced that this is the real growth market of our industry with the highest profit margins. I've many times revamped a system for more than the original install price. Here is an example of junk work I run into on a daily basis. The first are pics of two DVs in one 6" box The second is a leak we found in the same spot that was a poorly glued bell. The red line is where they should have seated. I mean we are talking dinky pipe here. How hard is it to glue a 1" pipe???!!!! Not only that I was able to peel them apart.