The connection from the first stage regulator to the second stage regulator is made by which component?

The connection from the first stage regulator to the second stage regulator is made by which component?

• A. low pressure hose
• B. intermediate high pressure hose
• C. air manifold
• D. direct line

Answer: (B)

In an SCBA setup, air goes from the cylinder through the first stage regulator, which drops the cylinder pressure to an intermediate level. That intermediate-pressure air then travels to the second stage regulator, which the wearer actually breathes from. The connection between these two regulators is made with an intermediate high-pressure hose because it is specifically designed to carry air at that intermediate pressure safely and reliably, with fittings that match the regulators. Using a low-pressure hose wouldn’t handle the higher intermediate pressure and is meant for air after the second stage or for accessories. An air manifold distributes air to multiple devices, not just link two regulators. A direct line would bypass the necessary intermediate regulation, which isn’t how the system is designed to function.

In an SCBA setup, air goes from the cylinder through the first stage regulator, which drops the cylinder pressure to an intermediate level. That intermediate-pressure air then travels to the second stage regulator, which the wearer actually breathes from. The connection between these two regulators is made with an intermediate high-pressure hose because it is specifically designed to carry air at that intermediate pressure safely and reliably, with fittings that match the regulators.

Using a low-pressure hose wouldn’t handle the higher intermediate pressure and is meant for air after the second stage or for accessories. An air manifold distributes air to multiple devices, not just link two regulators. A direct line would bypass the necessary intermediate regulation, which isn’t how the system is designed to function.