On the gauge in the diagram above, what is the maximum recommended operating pressure in psi (pounds per square inch) for the needle to remain in a safe zone?

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<img src='https://www.fatskills.com/images3/firefighter/21583cfac13fd2a9d44adf54cae6ed57.gif' border='0' alt='0267-02.gif' /><br>On the gauge in the diagram above, what is the maximum recommended operating pressure in psi (pounds per square inch) for the needle to remain in a safe zone?






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