Product review (5 stars): off brand, cheaper, it works (Whirlpool fridge likes it)
It fits like the namebrand part mentioned in the description.  Make sure you cycle about 10 cups of water through this thing via the fridge water dispenser before drinking, you'll see the carbon in the water at first..that's normal...it will be almost completely black in the water...but it will go away..use it water the plants...and remember to reset your fridge timer if it has one....enjoy

2nd Review:  6/19/2013:  I bought 2 more of these (6 month life span..I stretched it out..no problems)  I posted some pictures of the unit cut in 1/2 to show the black carbon tube filter in the center.  Just wanted to reiterate my Whirlpool fridge accepts this filter 100%.