you should use a glass jar atleast and I think those rubber hoses getting hot probably wouldn't be a good thing
I really like the jack daniels one though.
Rubber hoses wont get hot. The Way Duo works is fairly simple, The Slider rests atop the bottle, there's a tube from the neck of the bottle that goes 70% of the way down the middle of the bottle into water the hoses are on the other side, the smoke has to pass through water before it hits the rubber tubes, and the glass slider goes a ways into this middle middle tube and away from its sides so it doesn't melt any plastic, smoke just gets held within it.
And Thanks, I like the Jacks bottle a lot too esthetically, It sadly is only a mild hitter compared to Duo or Grav, and about par with Greenie.