Thanks for the pointers so far everyone.
At this point I am providing a backwater valve within an access panel per the building owners request. I just wish they said so right off the bat haha!
I am designing a sanitary system in which I am being asked to provide a 2" forced main from a duplex grinder pump and connect it into an existing 4" sanitary line that is gravity-fed. I know that the 2" line will require a check valve per the manufacturer specs, but since this is planned to be...
