Mine didn't come with anything. I tapped the cover, used a hole saw and then used a dremel to clean up the hole. You can use the trick flow efi filler kit for around 30 bucks if you want the filler neck with cap like stock. Or you can use comp cams part # VH031 which is a black poly baffled filler neck. That's what I used. only cost around 8 bucks.