Device for treating strand-shaped textile material in the form of a circulating product strand which is set in circulation during at least part of its treatment, with - a treatment container, - a transport nozzle arrangement which can be loaded with a transport medium stream, - a transport line adjoining the transport nozzle arrangement, via which the product strand can be moved by the transport nozzle arrangement in a transport direction, wherein - the transport nozzle arrangement comprises a transport nozzle with a nozzle inlet opening and a nozzle outlet opening for the through-passing product strand, between which at least two nozzle gaps (62, 72) are delimited for the transport medium, - the gap width of at least one of the nozzle gaps (62, 72) is adjustable, - of the nozzle gaps, at least one nozzle gap is configured to convey the through-passing product strand in the transport direction, and at least one nozzle gap is configured to convey the through-passing product strand in a direction opposite the transport direction, and - control means (49, 55) are provided for driving the through-passing product strand either in the transport direction or in the opposite direction via a corresponding actuation of the nozzle gaps, - a nozzle housing having the nozzle inlet opening and the nozzle outlet opening, in which housing at least one nozzle element (45; 46) is adjustably arranged which delimits at least one of the nozzle gaps and is controllable by the control means, characterised in that - the nozzle elements (45; 46) delimit two nozzle gaps (67, 72) with parts of the nozzle housing and at least one nozzle gap between the nozzle elements, wherein - between the nozzle elements (45, 46), spring means are active which are preloaded in the sense of changing the distance between the nozzle elements and which can be influenced by the control means, and - wherein the device has at least two annular nozzle elements (45; 46) which surround the through-passing product strand, which are delimited by the at least three nozzle gaps and which are mounted so as to be axially adjustable with respect to one another in the nozzle housing and controllable by the control means. - a treatment container, - a transport nozzle arrangement which can be loaded with a transport medium stream, - a transport line adjoining the transport nozzle arrangement, via which the product strand can be moved by the transport nozzle arrangement in a transport direction, wherein - the transport nozzle arrangement comprises a transport nozzle with a nozzle inlet opening and a nozzle outlet opening for the through-passing product strand, between which at least two nozzle gaps (62, 72) are delimited for the transport medium, - the gap width of at least one of the nozzle gaps (62, 72) is adjustable, - of the nozzle gaps, at least one nozzle gap is configured to convey the through-passing product strand in the transport direction, and at least one nozzle gap is configured to convey the through-passing product strand in a direction opposite the transport direction, and - control means (49, 55) are provided for driving the through-passing product strand either in the transport direction or in the opposite direction via a corresponding actuation of the nozzle gaps, - a nozzle housing having the nozzle inlet opening and the nozzle outlet opening, in which housing at least one nozzle element (45; 46) is adjustably arranged which delimits at least one of the nozzle gaps and is controllable by the control means, characterised in that - the nozzle elements (45; 46) delimit two nozzle gaps (67, 72) with parts of the nozzle housing and at least one nozzle gap between the nozzle elements, wherein - between the nozzle elements (45, 46), spring means are active which are preloaded in the sense of changing the distance between the nozzle elements and which can be influenced by the control means, and - wherein the device has at least two annular nozzle elements (45; 46) which surround the through-passing product strand, which are delimited by the at least three nozzle gaps and which are mounted so as to be axially adjustable with respect to one another in the nozzle housing and controllable by the control means.