Product review (5 stars): Great subsitute for the OEM filter.
Fits just like the OEM filter, does the same job at less than half the price.  Can't find any reason to buy the OEM anymore.  It comes with an adapter piece that fits the GE Culligan filtration fridge I have or I guess the piece can be removed to use in others.  just guessing here, but that's what it looks like.  Anyway, if you're using the adapter piece just make sure it's good and tight before attaching to the fridge.  Otherwise the water won't go through (it doesn't leak, it just doesn't pass through).  That's a pretty minor thing, though, and it solved all the clarity issues I was having with the local water supply.