Abstract: A cleaning system for an endoscope is disclosed wherein the inlets of respective channels of the endoscope are connected to a suction pump through a connecting device enabling the endoscope to be cleaned by aspirating fluid through the channels under operation of the pump. The connecting device includes as passage arrangement having a plurality of first connecting ports and at least one second connecting port. The device further includes control means to control fluid flow through the passage arrangement enabling individual channels in the endoscope to be isolated from the suction.