Ideal Pet Products 33-Inch to 38-Inch Sash Chubby Kat, Medium

Specially designed for sash windows and comes with a spring loaded locking slide and clear vinyl flap on standard plastic pet door models or a 4-way lock and unbreakable lexan flap on cat flap and chubbykat door models.
High quality white finish aluminum construction
Installs easily into most styles of sash windows
8 Window sizes available: adjustable width from: 23-inch to 27-inch (23), 27-inch to 32-inch (27) and 33-inch to 38-inch (33)
Flap size 6-1/4-inch by 6-1/4-inch
3 Window sizes available: adjustable width from: 23-inch to 27-inch (23) , 27-inch to 32-inch (27) and 33-inch to 38-inch (33)