Abstract: An improved connector arrangement for breathing circuit endotracheal tubes or the like in which one tube end is inserted into the other tube end. A secure connection is provided by means of a lug, groove and slot arrangement on the adjacent surfaces. When the tubes are moved axially together a lug protruding from one of the surfaces is engaged by a slot in the other and slides along the slot to a circumferential groove, thereby securing the two tubes together so that one can still be moved radially with respect to the other but not be disconnected by an inadvertent force exerted in an axial direction. A quick disconnect capability is provided by having the distance to the groove from the end of the tube along one side of the slot be less than that along the other side of the slot.