The VALUAIR PSS is a thermoplastic elastomer facepiece: Economical & Long service life. Rolled and flexible edges of the sealing flanges: High level of breathing protection. Perspiration port: Comfortable and effective seal. Four-strap stable monobloc harness: Optimised wearer tolerance. Click-fit cartridge fastening system: Ultimate safety. In combination with this half face mask, filter N Series Combination Filter A2P3 (1035455) can be used.