A rotary distributor for distributing a pressurized fluid to movable user devices comprises a first element associated with a fixed frame and connected to a fluid source; a selector having a plurality of openings connected to corresponding ducts for passage of the fluid to corresponding movable user devices; and a manifold having a first surface located in front of the first element and a second surface located in front of the selector. The manifold has an opening for passage of fluid between the first element and the selector. The opening has an extension able to touch a number of openings of the selector in movement to allow passage of fluid towards the openings. The opening of the manifold consists of a through slot, open on the first surface located in front of the first element and also open on the second surface located in front of the selector.