Review (1/5): DOES NOT FIT
It's supposed to be flexible and fit "most hair dryers" but it did not fit my ProAir 1875, which has a 2 3/8" opening -- just a little bigger than the diffuser's advertised opening. When I tried to pull the rubber of the diffuser over the dryer nozzle, the rubber ripped, and now I'm out the money. For four dollars more, I could have bought the ProAir 1875 with a diffuser -- which is exactly what I did today.