A needle protective housing is fitted to the neck of a medicament container,for example a glass vial, that has a circumferential notch formed at aproximal portion of the neck. The needle protective device has a needleprotective housing pivotally connected to a cup-shaped collar. The collar hasa base that is formed by a plurality of coplanar extensions, that in turn forman aperture that allows the base to be press-fitted onto the neck of the vial.The extensions are each separated by a space, so that the extensions wouldgive way when the collar is slidedly fitted along the length of the neck ofthe vial, until the extensions reach the notch at the proximal end of the neckof the vial where the extensions return to the original shape to therebycouple the collar to the vial.
