i know there are other threads about this but i have been looking around and none of them really answer my Q......any ways why are the rubber rings and the end of the down pipe bad? and what is this lil plastic/rubber looking thing

ps i havent seen any other types of bongs with out a lil plastic/rubber thing




(just a example)
Shivadas Glass: 12 " Glass on Glass Waterpipe
hurricanexxgame Reviewed by hurricanexxgame on . bong help asap i know there are other threads about this but i have been looking around and none of them really answer my Q......any ways why are the rubber rings and the end of the down pipe bad? and what is this lil plastic/rubber looking thing ps i havent seen any other types of bongs with out a lil plastic/rubber thing (just a example) Shivadas Glass: 12 " Glass on Glass Waterpipe Rating: 5