Product review (2 stars): A redesigned product makes installation much more difficult
This product has been redesigned, according to the manufacturer.  It is now slightly smaller and has a completely different connection than what it used to be.  The connection no longer looks like the product pictured.  The connection has 3 "teeth" instead of two, they are differently shaped, and it simply does not fit.  I have been unable to install it at all.

UPDATE:  After reading Patrick Rigney's helpful review of the same product I tried one last time to install the filter.  And in fact with considerable force it did finally work.  So I have upgraded my review from 1 to 2 stars.  I don't know why the manufacturer would redesign a product to make it so much more difficult for the end user.