Okay, So I bought a Bong the other day, with it same the bong itself, and two other separate pieces(bowl piece and down-stem). When I first went to use my bong, I did not realize that there was a bowl piece(it was wrapped up separately) and I was trying to find ideal water level with just the down-stem. It was making the "bubbling" noise that bongs do when I just had the down stem in, however once I put in the bowl piece It doesn't bubble as much and its extremely difficult to draw smoke. From what I have researched, I should have a rubber stopper and this will solve my problems. If this is what is giving me problems where does the rubber stopper go.