Constant 3/8-in. internal-diameter thick-wall tubing and connectors with large-bore enema tips result in easier administration of various barium suspensions as well as more efficient drainage. The new inflatable cuff is easily inserted and is more efficient than previously available retention devices and balloons. Efficient drainage is a distinct aid in controlling the amount and distribution of barium so that excess barium does not hide small lesions. Negative pressure greater than 10 in. of vacuum will only collapse the usual enema tubing. Lowering the enema can or bag below table height creates sufficient negative pressure for drainage if the internal diameter of the tubing is large enough and the wall thickness prevents collapse of the tubing. Without the aid of chemical evacuants, suction is limited largely to the rectal ampulla and rectosigmoid colon. In this region, however, drainage is a great aid in demonstrating small lesions. Two much barium in other parts of the colon by manipulation and positioning can usually be made to flow back to the rectosigmoid and rectum where suction can be effective. Older and debilitated patients can be made more comfortable during the examination. The most difficult patients may receive excellent examinations. Lesions in the rectum missed by both digital and sigmoidoscopic examinations have been easily demonstrated and diagnosed radiographically with the aid of drainage by large-bore tubing.