Pet Dog Screen Door Doggy Door with Magnetic Flap Lockable Dog Door for Sliding Door, Big Cat Door for Screen Door…

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Pet screen door can make your dogs and cats go in or out freely enough without asking for your help to open the door, great for your pet potty break or playtime.
Use a flat-head screwdriver or putty knife to separate the frame and door so you have six parts, two-half door frame, flap and tabs. Inner Door flap didn’t come with a screen insert, you have to put this on a screen you already own, then cut down the screen against the frame and place it inside the flap.
Swings both ways. Magnets slow the door down and stop it in place after 3-4 swings. Two plastic tabs removed that push into a hole to lock the door to stop pets in and out, double-sided slots lockable.
It is best to use glue to fix it during installation, but It didn’t come with any glue, need you to buy it. Whether you end up using glue or not, you must use four zip ties (provided) to hold the outer frame top and bottom to prevent the door from separating and falling.
Inner door hole size: 12 x 16 inches; Outer frame size: 13.8 x 18 inches, need to be installed base on the pet’s height, fit most breed cats and dogs, but not suitable for especially little kittens and puppies because this big door too heavy.