Phân biệt lọc khí xả tự động hoặc xả bằng tay

There are now many types of automatic and manual exhaust gas filters.
- For automatic exhaust filter, when the water condensate enough to float in the filter, the water will automatically drain to the end of the filter.
- For manual exhaust filtration, periodically, depending on the air quality, the operator directly manages the manual exhaust (valve pull).