definitely not universal but great if you have a dryer that it fits [SEP] i do not think this item should be marketed as a universal diffuser i tried it with a mid range remington a high end a mid range conair and a low end generic dryer the only one this diffuser worked with was the conair unless you have a bio ionic dryer you run the risk that this item will not fit your dryerwhen i finally found a dryer that worked with this diffuser the diffuser worked well this diffuser is very well made compared to the diffusers that come with most dryers first it is larger than typical diffusers second it swivels to open and close the air vents i find that it is best used when my hair is nearly dry to put the finishing touches on i was a bit skeptical of what a diffuser would offer at this price point but i think the build quality warrants the priceoverall i proceed with caution when ordering this product unless you have the bio ionic if you do own the bio ionic this item is fantastic and i highly recommend it