Product review (1 stars): Design change:  This doesn't fit.  The Samsung brand doesn't either.
For many years I have bought this model replacement filter in both Samsung brand and knock off brands.  I've never had an issue with fit or function.  Until now.  As other reviewers have noted, Samsung has changed the size/spacing of the plastic tabs on the filter locking mechanism for this model filter and it will no longer fit in my refrigerator.  Samsung insists the two designs are compatible and that we just need to apply more force.  No...it will not turn...at all.  No matter how much pressure my husband applies.  The grooves are different and it just doesn't fit.  At first I thought it was an issue with this brand....ordered the expensive certified Samsung model instead and same issue.

Edit:  Another reviewer suggested a fix to this problem that worked for us.  You can use an exacto knife to trim the plastic tab on the bottom right side.  After making this adjustment, we were able to install the product.