Hello, the question was edited to put a phone in it, it goes against the rules of the forum, the filter cover and others is assembled like this: filter, rubber seal (black), plastic washer (white) and threaded cover, put everything the armed assembly, without tightening the screw cap, in the filter hole until it stops, taking into account that the black rubber does not get to be seen, then start to screw the lid, this causes the black rubber to be pressed and from this way increases its diameter by making seal on the housing, greetings.