To ensure hygienic testing, the EasyOne Flow Tube respiratory tube is a disposable for single-patient use. EasyOne Air recognizes the correct position of the EasyOne Flow Tube in the EasyOne Flow Tube holder and gives feedback if the EasyOne Flow Tube is not placed correctly. The EasyOne Flow Tube is designed to work accurately with the ultrasonic sensor of EasyOne Air. For reliable results, use only the original ndd EasyOne Flow Tube.