Polar 20 Ventilator, Aluminum

Multi-Purpose Ventilators Aluminum Vent with Closure. This popular aluminum ventilator is supplied with an internal closure to open and close the vent. Just slide the lever to open & close vent. Back has four 2" diameter holes to allow flow of air. Can be used on cargo trailers, horse trailers and dry freight trailers. Front & back are aluminum. Insert is zinc plated steel. Shipped 25 per Carton.