Assembly for providing a passage for liquid between a first member and a second member

An assembly for providing a passage for liquid between a first member comprising a liquid reservoir and a second member comprising a liquid outlet, the assembly comprising:

• a first connector which is mounted on the second member and comprises piercing means by means of which an opening is provided in the first member, and a liquid passageway from the first member to the second member being defined in the first connector;
• a second connector which is undetachably connected to the first member, while in use the first and second connectors are connected to each other and the first connector is moved relative to the second connector in such a manner that the piercing means force an opening in the first member, whereby said passage is effected;
• the second connector comprising a passageway extending to the first member, in which passageway in use at least a connecting portion of the first connector is received, the connecting portion of the first connector being of tubular design;
• the first connector comprising on an outer wall a self-tapping multiple screw thread, which in use cooperates with an inner wall of the second connector, wherein the screw thread is configured such that forcing an opening in the first member is effected by turning the first connector relative to the second connector through an angle of less than 360 degrees, so that no round hole is cut out from the first member resulting in a partly cut-out wall portion that remains attached to remainder of the first member;
• and
• wherein a free end of the connecting portion comprises a plurality of teeth forming the piercing means and laying on a circle with points of at least two of the plurality of teeth being staggered relative to each ether in the axial direction of the connecting portion.