it has to be one of these, here are the diagrams of the pump assembly this shows all the gaskets in the pump , its probably one of the ones in #30 on the diagram, hope this helps, thanks Bryan
I found that schematic too. It looks like #13.
I just don't see where it seats, or how it could have gotten loose and into the dishwasher intact. I guess it must go outside the ring of fasteners on 14.
So if I loosen up the fasteners on 14 will I be able to work it back up into position? What and what happpens if the dishwasher runs without it?