Duck Covers Duck Dome Airbag for Chairs 33" to 40" Wide Fits into low points of outdoor furniture creating dome-shaped surface under cover. Eliminates pooling of water and debris on your patio furniture cover. No messy cleanup! Includes inflator adapter for use with the valve. Electric Air Pump (model number HT-198) sold separately. Fits into low points of outdoor furniture Creates dome-shaped surface under cover Eliminates pooling of water and debris on your patio furniture cover No messy cleanup! For use with chairs between 33" & 40" wide Rechargeable inflator (model HT198) sold separately 36"L x 36"W x 24"D