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QUQ Filler Breather Filter Series are designed to be used as a filler port for tanks, hydraulic power units or other fluid containers. These units filter the fluid as it is added and also lets the tank breathe, while keeping out airborne particles.
| Model | d | Air Filtration Precision |
| QUQ1 | 3-M4×16 | 10 20 40 |
| QUQ2 | 6-M4×8 | |
| QUQ2b | ||
| QUQ2.5 | ||
| QUQ2.5A | 4-M8×12 | |
| QUQ2.5B | ||
| QUQ3 | 6-M4×12 | |
| QUQ4 | 6-M10×20 | |
| QUQ5 | 6-M12×20 |
