The Freedom Pet Door by PetSafe is great for severe weather areas. Closing panel fits on inside of door and has locking pin. Heavy duty aluminum frame. Telescoping adjustable frame creates its own inner frame in doors from 1/16" to 2". Satin finish.
Small- 1-15 lbs 5-1/8" x 7-5/8" 8" x 2.25" x 13"
Med-up to 40 lbs 8-1/8" x 11-3/4" 11" x 2.25" x 16"
Large- up to 100 lbs 10-1/8" x 15-3/4" 13" x 2.25" x 20"
X-Large- 12-200 lbs 13-5/8" x 23" 16.5" x 2.25" x 27.5"
Replacement flaps sold separately.