The invention relates to an attachment for a syringe, carpule (81) or the like that has a distal end (91) and a terminating protrusion (79) thereon, wherein the protrusion (79) has an outer surface (83), a free end (85) and at least one recess (87) introduced into the outer surface at a distance therefrom. The attachment (1) has an annular main body (15) and can be placed on the protrusion (79). The main body (5) encloses a free space (7) into which the protrusion (79) can be introduced. The main body (5) comprises two materials, preferably consisting thereof, of which a first material is dimensionally stable and a second material is softer than the dimensionally stable first material and deformable. The main body (5) has at least one engagement region which engages with the at least one recess (87) when positioned on the protrusion (79). The attachment is characterized in that, along an imaginary circumferential line, the main body (5) has at least one first region with the first material and at least one second region with the second material, wherein the second material is deformed into the at least one recess (87) when attached to the protrusion (79), and wherein the second material is embedded into the first material.La presente invención se relaciona con un aditamento para una jeringa, un carpule (81) o semejante dispositivo que tiene un extremo (91) distal y una extensión (79) en el extremo de éste, la extensión (79) teniendo una superficie exterior (83), un extremo (85) libre y al menos una depresión (87) practicada en la superficie exterior a una distancia de éste. El aditamento (1) tiene un cuerpo básico (15) anular y puede colocarse sobre la extensión (79). El cuerpo básico (5) encierra un espacio libre (7) en el cual se puede introducir la extensión (79). El cuerpo básico (5) comprende dos materiales, preferentemente consistiendo de ellos, un primer material de ellos siendo de forma estable y un segundo material siendo más blando que el primer material d
