What is another word for collecting main?
Pronunciation: [kəlˈɛktɪŋ mˈe͡ɪn] (IPA) 
Collecting main is a term used in plumbing and refers to the main pipe that collects wastewater and carries it to the sewer or septic tank. There are several synonyms for the term collecting main, including sewer main, drain main, and wastewater main. These terms are all used interchangeably in the plumbing industry to refer to the pipe responsible for managing the flow of wastewater from a building. It is important to maintain and repair the collecting main regularly to prevent any blockages or backups, as these issues can cause significant damage and health hazards.
