This cover is durable and true to size. My only change would be to make the door a third of an inch wider as it would fit an Aqueon pump (cheap, regular and almost the smallest) pump if it was only a quarter of an inch wider. I assume you're thinking of reptiles and small mammals, but I use it for aquatic turtles and don't want a tight lid. I want them to have good airflow and the lighting flexibility (and slight splash guard) I get with the shield. Somehow I got it on a squint. but doesn't work perfectly. I'm surprised they didn't realize that the door could be useful for common uses like a pump, so there really isn't a product for what I want and it's solid (too strong to really get into the pump I would recommend it to anyone who has small reptiles and mammals, insects, hermit crabs, etc.
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