The Kitty Pass Cat Door for Interior Door - Cat Hole Kitty Door for Hidden Litter Box - Pet Door for Cats up to 21 lbs - Semi Gloss White Cat Door Interior Door

CATHOLE Wood Cat Door Classic Model - Original Interior Cat Door, Installs Easily, Removable Grooming Brush

PetSafe Plastic Dog and Cat Door, Small, For Pets Up To 15 lb, Paintable, Easy DIY Installation, Security Cover Included, Install in Interior and Exterior Doors or Walls, Durable, Adjustable Flap

SureFlap - Sure Petcare Microchip Cat Flap, White, Scans Pet's ID on Entry, Check Your Cat's Size,Flap Opening is 4 3/4” (H) by 5 5/8” (W)

Ideal Pet Products Cat Flap Door with 4 Way Lock, 6.25" x 6.25" Flap Size