... blockages in indoor facilities as in vegetable-rinsing basins, washing basins, kitchens, bathrooms and lavato GQ-4 Feafure: ... in vegetable-rinsing basins, washing basins, kitchens, bathrooms and lavatories, and bathing facilities. The air pump can stand a ... , for openings of different diameters and shapes. Using air release extension pipes will accommodate complex working environment.Operation ...