Help!!! Leaking from multiport valve

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So i am replacing the multi port valve....but when i attach new one it doesnt want to seat onto filter using new O ring....so i put old oring on, seats well and go on.....turn everything on....small drip on edge of filter between MPV/filter.

So i say..ok...put new Oring on.....tear everything apart again....put new oring on....BUT ITWILL NOT SEAT INTO FILTER TO SAVE MY LIFE....

ANYONE HAVE ANY TIPS TO GET THIS TO SEAT...IM GOING CRAZY