AODD Pumps | Double Diahragm Pumps. Metex Corporation Limited is a leading manufacturer's representative and distributor of AODD Pumps (Air Operated Double Diaphragm Pumps) for a wide range of industrial markets â including chemical, mining, oil & gas, power generation, pulp and paper, and general industry.
The following may be symptoms of fecal impaction: 1  Being unable to have a bowel movement. 2  Having to push harder to have a bowel movement of small amounts of hard, dry stool. 3  Having fewer than the usual number of bowel movements.  Having pain in the back or abdomen.
Symptoms of large-bowel obstruction can include: 1  A bloated abdomen. 2  Abdominal pain, which can be either vague and mild, or sharp and severe, depending on the cause of the obstruction. 3  Constipation at the time of obstruction, and possibly intermittent bouts of constipation for several months beforehand.