Dr. Shrink 4" x 5" blue wind powered s/a vent
Wind powered self-adhesive, weather tight vent. Removable top for easy installation. It moves air under the shrink wrap cover with even the slightest breeze and can circulate air 24 hours per day. The cups can be rotated to either deliver air or remove it, maximizing air flow under the cover and eliminating moisture buildup.
Size: 4" x 5"
MFG Part Number: DS-683WPW