Salem tube is used for decompression of a distented stomach by draining the fluid out. The etiology of distention is bowl obstruction, intenstine blockage, and prolonged stay of food in stomach. A salem tube has an air vent (called a "pig tail") side tube. The air vent should never be closed off during drainage because it provides the pressure to aspirate. The only time the air vent is allowed to be closed off is when checking for proper tube placement by pushing 15-20 mL of air into stomach and auscultate for the wooshing sound. If the air vent's open, air will not be delivered into the stomach.