Patented nose plug to be applied over the mask that allows to compensate the eardrums and the mask without using the hand. The toggles adhering to the nose piece of the mask are mounted on springs which, when stressed by greater pressure, open slightly, allowing the mask to be compensated as well. This nose plug adapts to any type of mask. In the UP-M1 and UP-MC1 masks, an anatomical silicone groove on the facepiece at the nose facilitates compensation and allows the housing of the UP-NC1 nose plug.