With standard thread connection in accordance with EN 148-1: Extensive range of filter types for all major areas of application, Conforming to EN 148-1, EN 14387, EN 143:2000, EN 371 CE approved (EN 141:2000), Filter with aluminium housing to ensure reliable recognition of possible damage, Individually packaged for optimum protection of the unused filter, Re-sealable for longer use, Shelf life (from date of production): 6 years for gas and combination filters & 12 years for particle filters