No.  Under normal situations – i.e. properly installed toilet systems – the SurePlunge will not cause any harm or damage.  However, if you suspect that you have a damaged toilet or damaged piping you should call a professional plumber to inspect and/or repair BEFORE using the SurePlunge. The SurePlunge uses a small CO2 gas cylinder.  It is only 8 grams and just isn’t strong enough to break or damage the porcelain toilet, damage the wax seal between the toilet/flooring/main piping.  Additionally, the 3″ piping found after the the toilet/wax seal is very large in volume and the small amount of 8g CO2 gas expands easily into this space. Most of the pressure is in the initial release – about 1/2 – 1 foot and dissipates quickly. The SurePlunge automatic toilet plunger has been specifically designed to deliver the correct amount of pressure.  It has been tested and used in millions of clogs world-wide in a wide variety of situations.