The internal neck measurement is 32mm which is the most common size for vacuum accessories.
The Universal Carpet Head is the standard cleaning attachment for ducted vacuums. If offers basic and reliable cleaning on most type of carpets and the retractable brush allows for some hard floor cleaning.
The Deluxe Universal Carpet Head offers greater carpet cleaning performance, thanks to its extra-deep air channel. It also features a unique pivoting neck and large roller, to ensure you glide over all surfaces.