@ A universal advancement deflector for impact irrigators, comprising a cylindrical surface portion (15) pivoted about an axis (11) external to its barycentre, and urged towards the irrigation jet so that it becomes inserted therein with one of its edges and its longitudinal axis disposed respectively tangentially and orthogonally to said jet, so that it inclines in orderto provide a reaction component which causes itto emerge from the jet; the load which the surface (15) presents to the jet and its rocking range being adjustable.