That's the "TP" in TP2000. There is a roll of standard-issue toilet paper in each counterlung to act as a water trap. While funny, this proved to be extremely effective, although I later added a plastic reinforcing tube (pink hair rollers) to the inside of each roll of TP to prevent collapse. Wonder if you're leaking? Just squeeze the Charmin - if it's mushy, you're taking on water. I did notice that cheaper brands are actually better than the more expensive ones, because the sandpaper-grade stuff tends to be rolled more tightly.

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