A small attachment designed to be fitted to an endoscope port for flushing of the endoscope’s lumen(s) during post-procedural washing, disinfection and/or sterilization. It is in the form of a plug that may include a button/switch for control of fluid (e.g., sterilant, disinfectant) and/or air through the lumen; it does not include tubing (i.e., not a tubing set). This is a single-use device.