An appliance is provided for connecting the water-tight cap of an endoscope using the distal end of the appliance to connect the water-tight cap over a venting pin connector to the proximal body of the endoscope or bronchoscope over the “S” connector by the proximal end of the appliance. In one version of the invention, one end of the appliance is connected to the “S” connector of the proximal body of the endoscope, as described in detail herein. In another version of the invention, one end of the appliance is wrapped around the proximal body of the endoscope, as described in detail herein. The invention also includes methods of operating the appliance.