Replacement door flap for the Small Electronic SmartDoor Pet Door (PPA11-10711).View door cut-out dimensions chart
To replace the flap, remove the top 2 screws and loosen the remaining screws. Place the 2 pieces of the 2 flaps so the hinge teeth surround the metal bar, then reinstall and tighten the screws.
Caution: Small children can pass through door. Read entire statement.