I have a conair 1600 and it fits with the adapter. Do you have the adapter? At first i thought that it didn't fit my dryer but after pushing a little harder it slid on. When you look inside the adapter there is a rubber ring around plastic prongs. That ring can stretch to accommodate most dryers. Try yours again with the hand off and press down with the adapter facing you. I'd be really surprised if all three of you dryers are too big for the adapter. HTH