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Summary: Learn how to find the broken part causing your toilet to run in this free do it yourself bathroom plumbing repair video.
"Hi this is Jon on behalf of Expert Village in this video clip I will be talking about identified the problem component. Now initially our diagnose was where this little flapper closes was not forming a tight enough seal that is letting the water slip through and lowering the water in the tank. Then the tank would have to feel itself back causing the toilet to run. In addition to that flapper not sealing correctly it looks like the bolts that held the tank onto the toilet base itself had some decomposition of those rubber spacers in there this could have contributed to our problem also. Lastly if we look below our float at the bottom of the tank there is another gasket it looks like it is also aging and could be contributing to our problem also. Due to the age to the components of the tank it is more economical to replace all of the components then have to go through this whole procedure again in another 3 months or 6 months if another piece breaks. "
eHow Article: How to Find the Broken Part in a Toilet Repair