Colorectal lavage device including a drain assembly, and a colonic tube assembly including an inflow tube, a flow control mechanism to control flow through the inflow tube, an outflow tube and a flow control mechanism to control flow through the outflow tube. The drain assembly has a tubular body defining an interior space and having a proximal portion insertable into an anus of a person to cause the anus to constrict around the proximal portion and thereby seal the proximal portion against the anal wall, a distal portion including a distal end having an opening in line with an opening in the proximal portion and a side tube arranged at an angle to the proximal portion. The inflow tube passes through the tubular body and has a tip with one or more apertures through which the lavage fluid operatively flows. The outflow tube is connected to the side tube.
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