Product review (1 stars): Answer to why this filter fits some Refrigerators and not others
Does not fit my GE Refrigerator Model PFS22MIWAWW which uses a MSWF. The outer thread diameter of this filter is larger then the last after market (and factory original) filters I had. So this will not screw in to the filter slot on fridge. I bought it in may and unfortunately waited till now to install.

On the box it shows the refrigerator models this filter fits, my model is not on there. The problem is, they don't give you what model numbers this filter fits on amazon product page, they just say its a MSWF filter replacement. Which doesn't help if you model takes a MSWF filter but is not on this particular filters model list.

So thats why you see some people saying it fits great (they were lucky, their model just happened to be on the list) and the rest of us, our models are not on this list (even though our refrigerators take a factory MSWF filter).