not compatible with black orchid diffusser [SEP] the whole reason i bought this was because it says compatible with black orchid yes i can get it on there but not easily and it does not stay my babyliss pro portofino the black orchid diffuser are each heavy items this soft silicone does not hold onto either of these items well it just came off every time i tried i like this diffuser a lot however i am going to have to buy the one that specifically fits my new portofino hair dryer if this sillicone happens to fit or has more to hang on too it might work for you i found it way more trouble than it is worth