This may be a stupid question. But I have an ejector pit in my basement for the washer and sink. I do not have any bathroom in my basement. Is there any reason to have the ejector pit vented? It currently is not. I assume the ejector pit drains to the main sewage line but I cannot tell because the pipe goes behind drywall (there's nowhere else it would logically go to). I just wonder if the pit should be vented if it is tied to the main sewer line.