The MSA 471373 Pressure Demand Exhalation Valve Type Facepiece Ultravue is a high-quality air supply facepiece designed for public safety staff and industrial use. Made by MSA in the United States, this model features a durable construction and reliable exhalation valve for safe and efficient breathing. With no expiration date and no modifications, this Ultravue MSA Facepiece 801457 is a dependable option for those in need of a reliable air supply in various settings.