A portable assembly of manually-operated devices designed to be used by or on a patient to irrigate the rectum with water, typically to provoke the defecation reflex for the evacuation of the bowels to treat/prevent constipation and reduce the risk of faecal incontinence. It typically consists of a control unit that regulates the air/water balance and includes a manually-operated hand pump to propel the water, a container for the water (e.g., a plastic bag), and a rectal nozzle/catheter to channel the water. It is intended for use in the home and healthcare facility. This is a reusable device.