MSA PremAire Cadet Escape Supplied Air Respirator with Medium Rubber Advantage 4000 Facepiece is ideal in construction, nuclear, oil And gas, sanding And grinding, spray painting and welding applications. It prevents the contaminants from entering the facepiece by retaining a slight positive pressure of air during inhaling or exhaling. Respirator is designed to be used with large, compressed air cylinder or a bank of cylinders set up in cascade fashion. It provides a first-stage regulator and cylinder valve within one assembly with its new streamlined design and can be operated with in an NIOSH-approved pressure range.