An endoscope has an elongated tube, end shell, and imaging window. A water channel is formed through the elongated tube, for supplying water toward a distal surface. An air channel is formed through the elongated tube, for supplying air. For use with an endoscope, a fluid nozzle unit includes a nozzle housing for mounting on the end shell in a removable manner. A water branch conduit in the nozzle housing is supplied with the water by the water channel. An air branch conduit in the nozzle housing is supplied with the air by the air channel. A converging channel is formed in the nozzle housing, for coupling the water branch conduit and air branch conduit together. A nozzle spout device is secured to the nozzle housing, disposed on the distal surface, for ejecting the water and air from the converging channel toward the imaging window.
