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Thanks for the reply, that was my question which screws do i exactly turn by 90 degrees, i tried few of them but it didnt work

I saw alot of Youtube videos, and it shows easily that we must rotate two nuts to fill up water in the valliant raditor plus water boiler, but my system seems different than youtube videos, i dont know exactly which screws to rotate, here are some pics of my whole connection system. Would love...