Many homes have sewer lateral cleanouts. A cleanout is a vertical pipe from an underground lateral to the surface. A sewer cleanout is a point of access where the sewer lateral can be serviced. It usually is 4" in diameter and has a tight-fitting steel or plastic cap over it. If you are not successful in locating your sewer cleanout, you either do not have one or it may be buried under dirt. A plumber can assist you with locating it. If your home does not have a sewer cleanout, you may want to add one as it allows you or your plumber quick access to stop costly sewage backups into your home.