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I have a new home that was pre-plumbed for a bathroom in the basement (toilet, sink, and shower.) The pipes are under that slab so I obviously can't see everything that's going on. The bathroom is more than 6' for the main stack so I'm assuming the plumbing configuration is for auxiliary venting. Can someone recommend a website that shows diagrams of different plumbing configurations so I can see the function of each pipe and where fixtures will get hooked up?