Call me a dummy; guilty as charged. My 100ml bottle of Tylan 50, as is the same with all YOUR 100ml bottles of Tylan 50, has a rubber cork in the top with an aluminum collar wrapped around it. I can certainly RIP that cork out, but I'm not sure I'm supposed to do that to draw the drug into the needly/syringe. The aluminum/cork assembly doesn't unscrew, and it seems likely that if I were to try to extract the rubber cork, it's gonna end up IN the bottle . Now we don't want that, do we class? So, how the heck do I get the stuff out? Do I stick the needle through the rubber thing each use, or........ I bet I'm not the only one to have this question; but maybe the only one gutsy enough to ask it!