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.
Obstructing lesions produce intrinsic or extrinsic mass effect on the colon or rectum. The. colon is dilated to an abrupt transition point, and a lesser amount of colonic air, if any, is seen. distal to the point of obstruction (i.e., no air in the rectum). Compared with small-bowel ob-.