This diffuser (sedu) says "velecta" on it because Velecta and Sedu are the same company. I have two sedu revolution dryers, the 4000i and 3600. Have seen pictures of the velecta dryers, which are made in Paris, and they look just like the sedu dryers and have the same features. For some reason, when I tried to research on the internet if they were the same dryer, no one would say. Read through all these reviews and some people mentioned another company name on the box, and so they thought this was not an original sedu product, but it is, because these two companies are the same. The fact that the "sedu" diffuser comes with a "velecta" name just proves it! Yes, this should fit all sedu revolution dryers, but it does fit very tightly. Someone mentioned difficulty in getting it off their dryer, but the nozzles that come with the dryer are also very difficult to get on and off. So, don't worry, it does fit. As far as the product itself, it is very heavy duty, seems very sturdy, but frankly, a diffuser is a diffuser, is a diffuser. The same as other diffusers of this type....The important thing is that it fits your dryer.
33 out of 34 shoppers thought this review was helpful.