These plugs offer a particular possibility of ventilation as well as prevention of hot spots. The convex head ends in a thin border and offers a proper cover. The perfect vent plug for control cabinets, machine housings and cladding panels. Impermeable to splash-water and vermin. Additional cogging for set up in sheet material. A tight fit is guaranteed in wall thicknesses up to 3.2 mm. Quick and easy mounting.