Abstract: A coupling comprises an inner body having an interior bore configured to receive a tube or the like. A collar is arranged to be axially received about the inner body. The collar being configured such that when it is forced onto the inner body, it applies a circumferential compressive force to deform the body inwardly. At least one interior annular projection defines one or more annular teeth arranged such that when a tube is received in the bore and the inner body is inwardly deformed by the collar, the one or more annular teeth engage the tube to seal with it. The inner surface of the bore comprises a plurality of circumferentially arranged projections defining a series of circumferentially spaced teeth axially spaced from the at least one annular protuberance and configured to engage the tube following compression of the inner body by the collar to prevent relative rotation between the tube and the inner body.

Abstract: A coupling for attaching to art end of a tube, pipe, conduit or other round solid or hollow section comprises an inner body section (A) having an interior bore (7) passing through at least a portion thereof configured to receive a tube or the like. A collar (B) is arranged to be axially received about the inner body (A), the inner body (A) and the collar (B) being configured such that when the collar (B) is forced onto the inner body (A). It applies a circumferential compressive force to deform the body (A) Inwardly. At least one interior annular projection (5) is provided extending into the bore (7) from the inner surface of the inner body section (A). The at least one annular projection (5) defines in an axial direction one or more annular teeth arranged such that, in use, when a tube or the like is received in the bore (7) and the inner body (A) is inwardly deformed by the collar (8), the one or more annular teeth (5) engage the tube or the like to seal with it.