Abstract: A vacuum system for applying vacuum to the body cavity of a patient where a vacuum flow indicator is provided that provides a visual display of the relative flow in a vacuum line to a medical patient. The vacuum indictor has indicia indicative of the no flow condition, a low flow condition, a high flow condition of flow through the vacuum system and has a space between the indicia of high flow and no flow so that the caregiver can visually get a quick and easy perception of the relative flow through the system. The vacuum flow indicator is not intended to be an accurate means of measuring that flow but only a guide that can aid the caregiver in determining and correcting a potential or real problem in the vacuum system.