For those who prefer a strong, telescoping Aluminum Frame. In 4 sizes for pets up to 120 pounds.

Pet Door Features Include

• Inner telescoping frame that adapts to doors of ¹/₂" to 1 ³/₄" thickness.
• High quality aluminum construction. Clear flap allows pet to see if slide is in place.
• Tamper Proof Mounting System, pet door can't be removed from outside.
• Thermo-Insulated Lockout Slide^™.