Ideal Pet Products Sash Cat Flap Small Pet Door, 23 to28-Inch

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
6 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
2 window sizes available: adjustable width from: 23-inch to 27-inch (23) and 27-inch to 32-inch (27)
Flap size 6-1/4-inch x 6-1/4-inch