Product review (4 stars): In my case I didn't need this part. I ...
In my case I didn't need this part.  I had just assumed that the old one was leaking and was sealed in place meaning it would break if you tried to clean it.  Not true, it just sits in the hole with plastic tabs.  In my case the filter flops down when you put the cover back on and some water spills while in use.  I found that if you open the vent with the new filter in place before putting the cover on, it will hold it and prevent it from moving.  Leak fixed and I kept the new one as a spare part.  4 out of 5 because it does what it's supposed to do.