The swivel was created to enable easy disconnect of the mask from the frame. The connector usually will stay in the tubing and allows for the patient to remove their big tubing easily. This then allows quick visits to the bathroom at night without having to remove the mask. The Eson 2 swivel is a clear colour whilst the Eson Swivel is a dark grey colour. The Eson 2 swivel and Eson swivel are interchangeable and the Simplus swivel is the same as the Eson swivel.