AIR ONLY - Deck Ventilator 230 mm - White

Air-Only Low Profile Deck Ventilator With Build-in Air-Only, let air in and keep water out via the use of spherical floats.

The Soft PVC balls float within the vent as soon as there is water on deck, along vertical guides, and form a watertight seal.  As soon as the water subsides, the balls descend, letting air in again.