Abstract: A retaining clamp device holds a tubular air fitting to an endotracheal tube or tracheostomy, e.g., disposed on the neck of the patient. A C-shaped clamp member is formed of a resilient semi-rigid plastic and has an inside diameter that fits snugly over the air fitting, with one or more legs connected to the C-shaped clamp member. The legs have slots at their free ends to fasten the clamp member to said to the flange of the endotracheal tube assembly, e.g., using the Velcro strips that hold the flange to a neck collar. The legs can include left and right leg members that extend from opposite sides of the C-shaped clamp member. The attendant or patient can snap the C-shaped member on or off the fitting of a ventilator tube, moving the C-shaped member to the side.