Can anyone help me identify this Danco Push-button sink stopper model? I need to replace the stopper part, because the rubber gasket is breaking up, so it doesn't stay closed when you press it down. But I don't want to replace the in-sink portion, so need to buy the exact same thing so the stopper will fit in the existing installed receptacle. Does anybody recognize this item? I'm not sure whether it's with overflow or without overflow. Thanks a lot!