Product review (5 stars): This will fix your fridge. YOU DON'T NEED TO GET A NEW GROMMET.
This will completely fix your problem of defroster backing up. You will NOT need a new grommet, this REPLACES the failure prone rubber grommet.
  Amazon tries to bundle this with a  grommet, don't fall for it. With this drain pipe the grommet is not necessary, and therefore a waste of money.