I read the post from Wesryan (basement ejector pump). It answered most of what I needed to know, though I still have some questions. I have a split level house built in 1966. The crawl space was dug out and the laundry tub was placed down there. The contractor installed the ejector pump in the pit, with the ejector side connected to the drain pipe and the laundry tub drain going into the pit. I replaced all the DWV with PVC and was going to vent the drain, but then realized the vent would be downstream of the trap. #1-does this need to be vented? If so, with a dedicated vent? The only drain is the tub and this has been set up since 1979 with no smell or drainage problems. # 2-I fully understand the concept of venting the sewage ejector, and it makes sense; however does the length of the vent pipe from the pit to the DWV connection make an operational difference? The ejector for the bathroom, installed at the original crawl space level, was vented into the drain vent. I replaced the DWV the same way. This is the way it was set up in 1966 and again never experienced any problems. Maybe codes have changed since then. #3-what is a studor vent? Thanks