We will beat any advertised price on this item. Find a lower price online and we will match it! Call us at 888-286-2347 Ext. 708 or for your price match. Large Single Flap Replacement is also called as single flap replacement flap which is all one piece and can only be used for Classic AF30-201-11, AK30-601-11 & Patio Panel pet door AA31-211-11. Each pet door needs a flap in order to protect your cat or dogs from the bad weather and their enemies. Features: Large Single Flap Replacement. Used with PetSafe Classic AF30-201-11, AK30-601-11 & Patio Panel Pet Door AA31-211-11 10 1/2 inch x 15 7/8 inch Opening.