i have a dd res it is fine now sucked at first
what i did was bought a diff cap so that the rubber oring actuly gont squesed all around before it leeked becase it was not a rount top it was a hex so the ruber o rignt just colapsed around the edge and was usless
then i filled the holo point in the new cap with silicone so that it wouldnt introduse air
then i got a sheet of gaskent cork and put that between the top of the res and the top of my case
that way when i fill i just fill till it over flows then cap it off and let it spill on the top of the case the cork stops it from geting the inside wet that is KEY
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