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Which of the following is not a type of pressure tank used on private water supply systems?

  1. Hydro-pneumatic

  2. Diaphragm

  3. Bladder

  4. Spinning disc

The correct answer is: Spinning disc

Spinning disc is not a type of pressure tank used on private water supply systems. Hydro-pneumatic, diaphragm, and bladder are the three common types of pressure tanks used. Hydro-pneumatic tanks use air and water to create pressure, diaphragm tanks use a flexible rubber diaphragm to separate air and water, and bladder tanks have a flexible rubber bladder that contains the water and air. Spinning disc is not a type of pressure tank and is therefore incorrect.