What is the maximum pressure setting for a second stage regulator in propane systems?

• A. 4 psi
• B. 10 psi
• C. 2 psi
• D. 6 psi

Answer: (C)

Propane regulator systems use stages to reduce tank pressure to a safe, usable level for appliances, and the second stage is the final step that feeds the appliance with a very low, stable pressure. This stage is designed to cap the outlet pressure so gas flow stays predictable and safe across different demands. The maximum pressure it is built to deliver is about 2 psi, which keeps the gas input to most appliance regulators within their safe operating range. Pressures higher than that—such as 4, 6, or 10 psi—would push too much gas, potentially causing unsafe flame characteristics, regulator strain, or hose and burner damage. In practice, the actual operating pressure to appliances is much lower, but the second stage is sized to limit it to around 2 psi as a safe upper bound.