Question 126Refrigeration & AC - Assistant Engineer

The correct answer is B) pressure regulator. When using nitrogen to pressure leak test a system, the nitrogen cylinder must be equipped with a pressure regulator. This is because the nitrogen cylinder contains the gas at a very high pressure, typically around 2,000-3,000 PSI. Without a pressure regulator, this high pressure could potentially damage the system being tested or cause injury. The pressure regulator allows the user to control and lower the pressure of the nitrogen being released into the system, ensuring a safe and controlled leak test. The other answer choices are incorrect. A temperature indicator is not required, a blue top is a feature of oxygen cylinders, not nitrogen, and a level indicator is not necessary for a pressurized gas cylinder.