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I bought a house that has a second bathroom in the basement. I would like to replace this toilet.

It appears to have a single water inlet and two over flow tubes. The refill hose tees into the regular overflow tube and into a second overflow tube. The second tube has a line out of the toilet tank and into the wall.

The tank model is a Proflo 3112 - E. I have not found any information online that refers to this setup.

What kind of toilet is this and where does the second overflow tube go?

enter image description here

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  • Looks like whatever it is was retrofitted to one of the tank bolt holes. This is interesting. Any chance of a photo under the tank on that right side? – JPhi1618 Jul 9 '19 at 6:01
  • The view doesn't reveal much - the line exits the tank and into the wall. Nothing more. – diyse Jul 9 '19 at 6:27
  • So on the right side there is a line that exits the tank and goes into the wall? I know the water supply line on the left probably does that. On the right, under the tank, you should see where the metal tube that your tee-d filling line goes into exits the tank. – JPhi1618 Jul 9 '19 at 6:30
  • yes, the second overflow line exits the tank and goes into the wall. It's a braided line, looks similar to a supply line, but no valve. – diyse Jul 9 '19 at 6:31
  • Where are you located in the world? I've never seen that - I hope someone else can share some knowledge. – JPhi1618 Jul 9 '19 at 6:33
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It's a line to fill other traps that may run dry when not used. Every time you flush some water is diverted to top up the traps and prevent a sudden stink of sewage.

These traps that need topping up would be for example the floordrain in the basement or the drain for a water heater safety valve.

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