It's almost big enough that you'll spend a fair amount of time adjusting, stretching and trying to get it to work so you Reassemble your water filter. But in the end, even after I stretched it, the o-ring leaked badly and I had to take it apart and keep it unplugged until I could go to the store and buy one of their seals, which was actually cheaper. As a possible explanation for sizing issues, a GE brand o-ring replacement kit contains 2 different sized o-rings (labeled A and B) and some o-ring lubricant. The packaging then says which filter A is using and which filter B is using, so it seems like GE has used 2 different sized o-rings on their 2.5 inch filters over the years, but from the model number it should be clear which model which O-ring is used.
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