Step One Hold 2Chamber P2 Respirator mask by main body allowing straps to hang down. Step Two Insert mouthpiece into divider as shown. Step Three Adjust mouthpiece to fit slightly away from mouth. Step Four Hold the respirator against the face with the nose aligned with the bridge of the respirator mask. Step Five Place top strap on the back of the head and the bottom strap over head and below ears. Step Six Test fit of mask by cupping mask by main body and inhaling.If no negative pressure is found, reposition respirator as necessary with steps three, four , and five.If the mouthpiece is too close to the mouth, reposition with steps two and three.