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What is the minimum constant water pressure required at each fixture according to the Illinois Plumbing Code?

  1. 6 p.s.i.

  2. 8 p.s.i.

  3. 10 p.s.i.

  4. 12 p.s.i.

The correct answer is: 8 p.s.i.

The minimum constant water pressure required at each fixture according to the Illinois Plumbing Code is 8 p.s.i. This standard is set to ensure that all fixtures function effectively, providing adequate flow and preventing issues like slow drainage or inadequate flushing. Having a pressure of 8 p.s.i. ensures that water can adequately reach all parts of the plumbing system and enter fixtures such as sinks, toilets, and showers properly. This specified pressure helps maintain efficiency in operation and enhances overall performance, ensuring a satisfactory experience for users. Understanding the importance of this requirement also clarifies why pressures lower than 8 p.s.i. could lead to problems such as decreased water flow or interruptions in service, which can negatively impact plumbing systems in residential and commercial settings.