• Quick and easy installation and removal with spring-loaded frame
• Height is adjustable up to 3 inches to fit most horizontal sliding windows 
• Non-custom height ranges of 34-37", 43-46" and 46-49" can be found on the Whiskers & Windows Cat Door for Horizontal Sliding Windows page
• Durable horizontal sliding window pet door for Cats and Large Cats or very small dogs 

The Whiskers and Windows Horizontal Cat flap door for Windows is a fast, hassle-free, affordable way to install a pet door for cats in your home. This aluminum or vinyl window insert requires no drilling or cutting (can be trimmed 3/4" shorter with a metal cutting blade if needed) and can be installed in seconds. Our spring-loaded pet door insert design allows for instant adjustment of up to 3 inches and creates a snug weather-tight fit. For increased insulation, you can purchase foam weather stripping to seal where the window frame and pet door meet. 

Features:

• Great for renters with low-impact installation
• 3/16" clear safety glass is 59% thicker than the standard for enhanced durability and increased energy efficiency
  
• Small can fit cats up to 10Lbs and the Large is suitable for cats and small dogs up to 15Lbs
• Easy to install with spring-loaded design
• Lightweight, clear flap is easy to use
• Flap is lockable 4-ways (Unlocked both tabs center | Locked both tabs outside | Out-only both tabs to right | In-only both tabs to left )
• Allow 3-4 weeks for any custom options