a mask connection for a fluid-communicating connection to a breathing area of the breathing mask, the mask connection being configured to be placed adjacent to the breathing mask;

a first tube connection, with a first tube connection axis, for a fluid-communicating connection to a breathing tube, the first tube connection having an incoming air valve;

a second tube connection, with a second tube connection axis, for another fluid-communicating connection to another breathing tube, the second connection having an outgoing air valve, wherein the first tube connection axis of the first tube connection forms an acute tube connection angle with the second tube connection axis of the second tube connection, wherein the first tube connection axis is adjustable relative to the second tube connection axis for changing the tube connection angle;

a mask adapter body comprising an upper end portion, a lower end portion and an angled mask adapter body surface configured to face in a direction of the breathing mask, the angled mask adapter body surface extending from the upper end portion to the lower end portion, the mask adapter body further comprising another mask adapter body surface located opposite the angled mask adapter body surface, the another mask adapter body surface being configured to face in a direction away from the breathing mask, wherein a distance between the angled mask adapter body surface and the another mask adapter body surface increases in a direction from the upper end portion to the lower end portion of the mask adapter body, the mask connection being substantially in a middle area of the angled mask adapter body surface.