Installing a bathroom plumbing system typically entails installing a system of pipes, drains, valves, and other fittings for water distribution. The current trend is to have concealed plumbing, so it is critical to avoid any mistakes, as any minor re-do work will require you to break wall tiles. A general understanding of bathroom plumbing will help you know if you're remodeling or redesigning your bathroom. It will be useful when remodeling or updating your toilet, but it is also useful to know if something goes wrong with your bathroom plumbing – you will know what the issue is and possibly how to fix it.