I don't have an Intex, but from what I've seen, it does look like a drain. Is there a way to slow down the water loss until you find/buy a new cap? You could buy an adjustable rubber stopper to plug it up until you find a new cap.
There should also be a cap / plug inside the pool as well kinda like an air mattress. That may have gotten dislodge & forced the loose outer cap off. At any rate you can screw a water hose to it & direct it back into the pool until you find a better solution
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