Reusable respirators, parts and accessories include a broad range of components for half and full facepiece respirators, which are used to filter workers' air. Inhalation and exhalation valves help facilitate safe breathing standards. Various types of assemblies contain multiple parts for simple replacement. Nose cups, valve assemblies and disks are available to replace individual components in existing respirators. Caps, D-rings, filter covers and gaskets are available for PAPR (powered air purifying respirators) and SAR (supplied air respirators) maintenance and repairs. Air pumps, blowers and parts help to ensure optimal air system efficiency.