Obstruction kiddies? Anyway in my instructions it shows you clearly what to do, what I did was just drill the hole, and then screw the barb in while looking inside of it until it was flush. Then just mount and connect the hose and you are done. Took me all of maybe 15 minutes? In return to the earlier posts, im not trying to rip people off or dump them with worthless stuff, if for whatever reason you are thoroughly disgusted with the bottle you can send it back for a refund. (Also they make these neat little plugs which fit in the same thread as the hose barb if you wanna stop using the bottle for whatever reason)