Product review (5 stars): You only need this part & not the other two as stated in the description.  This one works just fine on its own.
I read a few reviews before ordering this part & I'm really glad that I did.  The description states that you need two other parts to assemble this filter assembly; however, that is not accurate.  I only ordered this part & it fits perfectly & works just fine.  You do NOT need the other two parts for this to work.