Look all the way around the 510 connector, just above the threading. Are there any small 3/64" holes right above the threading? That is normally where the air flow is supplied on the sealed connector attys.
If there are not any (manufacturer screw up, sealed center pin on a non sealed 510 connector), you can take a dremel and a 3/64" drill bit and drill one or two hole dependng on you vaping style. Becareful to only go through the first layer of metal and not drill into the center post or wire. But that is only if there are no air holes above the threading.
Dan