A Housing for an infusion pump cartridge adapted to enclose a glass vessel having an open proximal end closed by a slidable piston and a distal end provided with a neck is provided. The housing is made of plastic. The proximal end is provided with a pair of bayonet fitting formations integrally formed on the housing and adapted to enable the cartridge to be fastened to an infusion pump and with connection means adapted to be arranged at the distal end of the vessel for connection to an infusion set. The housing consists of a cylindrical base part, which is provided with an inner flange for abutment of the vessel and on which the fitting formations are formed, and a neck part that can be fastened to the base part by means of snap fitting formations for retaining the glass vessel between the base part and the neck part.
