A sterile, hollow cylinder intended to be inserted into the rectum for the administration of irrigation fluid from a connected colonic lavage system or a colonic irrigation unit. It is typically designed as a one-piece, moulded nozzle that may have a slight bulb shape at the distal end to improve retention in the rectum and a barbed fitting at the proximal end for the attachment of the irrigation fluid tubing. It may be designed for open (entry of fluid only) or closed (entry of fluid and evacuation of waste), and clinical or home-use, colonic lavage. This is a single-use device.