They both have that . The one I think is fake has a slightly bigger hole in the top for the drip tip. I bought 3 online 2 from the same place and both of them work fine. The 3rd doesn't work at all. It's the one that I think is fake bother at a glance look the same. But the fake one has a slightly bigger plastic box. I'm not sure of all the other difference between the two but I know that they have a few. I just checked the hole the drip tip goes in is bigger on the one I think is fake but the real one is actually longer and bigger in diameter. I hope this helps you to know which one is real and which is fake . I would really like to know. Also like I said I got all 3 on ebay. Thanks a lot. If you know someone else that might be able to help please let them know.