Elastomeric half mask is the economical solution that does not skimp on features With ppper head straps have minimum give to provide secure support, and wide contoured sealing area provides great fit. The low “dead air” space limits re-breathing of exhaled air for increase comfort and worker productivity. Latex free straps stretch and move with the worker while providing optimum support. Various thickness in sealing area for improved comfort and support - more support around the chin area and more flexibility on the nose bridge. The North 5500 Series half mask is the economical option that still provides many of the same features found in premium masks. REPLACEMENT PARTS 770016 - Inhalation Cartridge Connector 770017 - Inhalation Valve Flap 770018 - Exhalation Valve Flap 770019 - Exhalation Valve Seat 770020 - Exhalation Valve Guard 770092 - Headband Assembly