Product review (5 stars): This replacement stopper spares me from having to argue with my husband
I'm not sure what possessed my husband to put our original Insinkerator stopper in the dishwasher several times over, but I highly suggest you DON'T DO THAT.  It completely ruined it and we were no longer able to even get it to fit into the disposal opening.  The replacement stopper works perfectly and we no longer argue over why the stopper was ruined in the first place.