Because water can get inside the threads, but not through the o-ring which is on the other side... if threads were waterproof we wouldn't need to put o-rings on the outside to keep water from leaking out.
:offtopic: Your quote in your signature Niksub1 is wrong, it goes "Real stupidity beats artificial intelligence every time." -Hogfather, by Terry Pratchett
Terry Pratchett is one of my favorite authors hehe :offtopic:




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