Just used a fluid flush adapter on my 2005 F150. It was difficult to get him to sit on the tank, it took me more effort than I would have liked. When I first used it I couldn't get it to seal no matter what I did. I'm not sure what the second o-ring is official for as there's no manual for it, so at first I thought it was just a replacement for what's in the cap should it fail. I ended up putting it on and rolling it over the o-ring that's already in the lid and that finally allowed it to seal. However, it didn't fit my 2010 Fusion Sport, but it did fit my 2005 F150.
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