I have one of those things. I attached a 6' snorkel that has my dive flag zip tied to it. Best thing I did was attach a real muffler off of a motorcycle to it to make it bearable for the guy keeping watch. I would highly recommend an accumulator tank. You can buy aluminum ones online with a bunch of threaded bungs to plumb it inline and provide a drain for the water. It will cool and dry the air before you breathe it and most importantly provide a reserve when the engine stalls or runs out of fuel. You can actually feel the pressure dropping while you're diving and plan your ascent versus one normal breath and then none. I love my hookah rig.
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