Create the perfect salon finish with the ghd professional diffuser (incl. adapter ring). Developed in collaboration with top stylists, this attachment helps to enhance natural curls. The included adapter ring allows the ghd diffuser to be used with the ghd air® as well as the ghd helios®.Directions for use:ghd helios® hairdryer: with adapter ring, the diffuser can be used with the ghd helios®.ghd air® hairdryer: Without adapter ring, the diffuser can be used with the ghd air®. To loosen the adapter ring, turn it counterclockwise to release.