A sewer cleanout is also important
As you probably know, you will find underneath your sink a square-topped pipe and it is very important to ask your plumber if you want to remove or change it. In fact, everything related to the sink and the pipes is important and installed for a purpose, but do not try to change them except with the help of a plumber.
This square shaped pipe is called sewer cleanout and “lets the plumber have access to clean out your drains if they get clogged,” says Taylor.