A yoke configured to be coupled to a mask frame of a respiratory mask system comprising: a front wall extending from a first end to a second end; a rear wall extending from a first end to a second end, the front wall and the rear wall defining an inner cavity therebetween; characterised in that the yoke further comprises: a first end cap coupled to the first ends of the front wall and the rear wall and a second end cap coupled to the second ends of the front wall and the rear wall, each end cap comprising an entry hole configured to receive a filament of a self-adjusting headgear system; a first housing of a directional locking mechanism disposed between the front wall and the rear wall adjacent the first end cap ; a second housing of a directional locking mechanism disposed between the front wall and the rear wall adjacent the second end cap ; and a line track divider dividing the inner cavity into an upper line track and a lower line track , wherein the upper line track extends from the first housing of a directional locking mechanism to the second end cap above the second housing of a directional locking mechanism , and wherein the lower line track extends from the second housing of a directional locking mechanism to the first end cap below the first housing of a directional locking mechanism . a front wall extending from a first end to a second end; a rear wall extending from a first end to a second end, the front wall and the rear wall defining an inner cavity therebetween; characterised in that the yoke further comprises: a first end cap coupled to the first ends of the front wall and the rear wall and a second end cap coupled to the second ends of the front wall and the rear wall, each end cap comprising an entry hole configured to receive a filament of a self-adjusting headgear system; a first housing of a directional locking mechanism disposed between the front wall and the rear wall adjacent the first end cap ; a second housing of a directional locking mechanism disposed between the front wall and the rear wall adjacent the second end cap ; and a line track divider dividing the inner cavity into an upper line track and a lower line track , wherein the upper line track extends from the first housing of a directional locking mechanism to the second end cap above the second housing of a directional locking mechanism , and wherein the lower line track extends from the second housing of a directional locking mechanism to the first end cap below the first housing of a directional locking mechanism . a first end cap coupled to the first ends of the front wall and the rear wall and a second end cap coupled to the second ends of the front wall and the rear wall, each end cap comprising an entry hole configured to receive a filament of a self-adjusting headgear system; a first housing of a directional locking mechanism disposed between the front wall and the rear wall adjacent the first end cap ; a second housing of a directional locking mechanism disposed between the front wall and the rear wall adjacent the second end cap ; and a line track divider dividing the inner cavity into an upper line track and a lower line track , wherein the upper line track extends from the first housing of a directional locking mechanism to the second end cap above the second housing of a directional locking mechanism , and wherein the lower line track extends from the second housing of a directional locking mechanism to the first end cap below the first housing of a directional locking mechanism . <EOS>