Fuliko Registers Grilles Vents Grille Air Vent 3/4/6 Inch Plastic Air Vent Cover Bathroom Wall Ceiling Exhaust Pipe Ventilation Grille for Round Duct

* aerodynamic disk design guarantees air . *Constructed from plastic. Can be for water or pumping, suitable for purposes. *Smooth airflow regulation due to rotation of the central part of the damper.