This circuit was designed with the help of a prominent respiratory disease specialist. The circuit was designed to work in conjunction with the 07-8476448 Nebulizer pump. Its function is to increase the inhalation percentage and decrease the exhalation or vented product. This is accomplished by: 2 (1-way) valves that restrict flow direction and a bacterial filter that traps wasted nebulized drugs. The operator will have less exposure to nebulized drugs.