Title: Lock feature is useless.
Product review: This was very easy to install. Ignore the review where they state to cut the hole after you install it. It's impossible to install the door without the hole already being cut. I installed this on my screen door from my screened in porch. All you do to install, is hold up one side of the pet door to the screen, cut the screen, leaving some slack to attach to the pet door, then snap the other side on. No need to remove your door to install the pet door (as stated in instructions).The complaint that I have about this thing is the locking feature. If you lock the pet door, your pet can easily just push the whole pet door through the screen (the pet door casing and all). It is so annoying always having to put the door back up, after my cat knocks it down. Purchase this pet door, knowing that you won't be able to lock it close.
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