Size:Medium The PetSafe Replacement Flap is a soft, vinyl flap with a magnetic closure. Replace your dirty, weathered pet door flap and make your pet door look brand new again. Compatible with the PetSafe Medium Plastic Pet Door, Medium Freedom Aluminum Pet Door, Medium Extreme Weather Pet Door, Medium Freedom Patio Panel Pet Door, Medium Sliding Glass Pet Door and new version of Medium Wall Entry Aluminum Pet Door. Screws and flap mounting bar sold separately. For the Extreme Weather Door, this is the vinyl flap on either side of the yellow insulated flap. If you need to replace the middle flap, you will need to purchase an Extreme Weather Insulated Flap Kit. The Wall Entry Aluminum Pet Door uses 2 flaps on either side of the tunnel for extra energy efficiency. One flap is in the inner opening and one is for the outer opening.