TheraPEP PEP Therapy SystemTheraPEP PEP Therapy System The PEP Therapy System of TheraPEP is a sophisticated device that was designed to assist people in improving functional and respiratory health. Using positive expiratory pressure therapy, which uses the force of exhalation to improve the airway's clearance and lung expansion and mobilize mucus, While protecting against airway collapse, the device aids individuals in improving the health of their respiratory system and