... the wearer’s respiratory organs, eyes and facial skin. The mask is designed for use by military, ... industry, agriculture, storehouse, scientific research etc. The mask is equipped with a drinking system. If necessary ... less than 30%.(6),Weight: Complete set of mask app.700 grams.(7),Storage life: More ... suction tube in the mouth.3,The complete mask, particularly the lenses and the expiratory valve, ...