A bag valve mask (BVM) is a device used to provide positive pressure ventilation to individuals who ...are not breathing or are breathing inadequately. It consists of a self-expanding bag, a unidirectional valve, and a facial mask. The BVM allows a rescuer to deliver oxygen-rich air directly into the lungs, making it an essential tool in emergency situations. Bag valve masks are often also referred to as Ambu bags or manual resuscitators. The Red Cross Store offers BVMs for adults, children and infants.Read more