When connecting to an existing Miami Dade Water and Sewer Department (MDWASD) sewer line. The utility company will require you to install a clean out. The cleanout is typically a section of PVC pipe with a round removable access cap. When located in the sidewalk away from a driveway the cleanout is installed inside of a precast concrete box. When installed in a driving surface the cleanout access is cast iron valve box lid. MDWASD typically specs out a No 53 valve box & lid.