Product review (5 stars): Bargain Purchase!
Simple to order and shipped quickly. Installs by hand (no additional tools required). Note that each comes with an upper O-ring installed, but does not have the cup O-ring (bottom). However, when you unscrew the cup the bottom, large ring can be CAREFULLY pried out and coated with either silicone spray or Vaseline jelly (alternatively can be applied to the bottom of the filter where contact is made) and will last as long as the whole refrigerator.