Abstract: A polymer duct configured to be connected to a nozzle of a system for transporting a fluid has a circumferential groove into which is mounted a clamping collar configured to clamp the duct against the nozzle, the groove being delimited by two lateral rims comprising radially projecting lateral studs with which the collar cooperates to be rotationally blocked relative to the duct. The collar has a circumferential clamping strip having two ends which overlap in an overlap region of the strip, a strip clamping member and a non-metallic blocking cover having an abutment portion. The abutment portion has a pair of lateral fins which extend in the radial and axial directions and abut against axial and lateral faces of the lateral studs.

Abstract: The present invention relates to a clamping collar suitable for fitting in a groove of a polymer duct to be connected to a nozzle for the transportation of a fluid, such a duct fitted with this collar and a method for blocking the rotation of the collar on this duct. The invention applies in particular to a pressurized hot air duct for motor vehicles of plastic material type and requiring a fitted metal collar. This clamping collar (1) comprises: a circumferential clamping strip (2), two ends (2a and 2b) of which overlap in an overlap region of the strip having two radially internal and external overlapping faces, a strip clamping member (3) mounted in contact with said overlapping faces, and a blocking means (6) mounted on the clamping member and capable of blocking the rotation of the collar in the groove (11) of the duct (10) by the rotational abutment of this blocking means against at least one lateral rim (12, 13) of said groove.