The respirator is suitable for the used lubricating oil storage barrel to prevent the outside pollution particles and moisture entering, simple and practical, widely used in gear box, hydraulic oil, oil storage irrigation, transformer and other equipment, non-highway vehicles, food processing, petrochemicals, injection molding, pharmaceuticals, lubricants and fuels, power generation, metal manufacturing, paper, mining and steel mills and other industries. Features of dry respirator: 1. With standard thread, easy to replace the ordinary breathing cap; 2. Micron filter cloths ensure no solid contamination. 3. When the absorbent is full of water, the color changes from blue to pink. 4. Activated carbon absorbs oil mist from the system. 5. The case is made of high-strength plastic and can withstand temperatures up to 90 degrees. 6. For closed systems only;