What component is prohibited between the first-stage and second-stage regulator?

The component that is prohibited between the first-stage and second-stage regulator is the hose. This is important for several reasons, primarily concerning safety and the integrity of the LP-gas system. Hoses can be more prone to leaks compared to rigid piping due to their material composition and potential for wear and damage over time. For this reason, the use of rigid pipe is required in this section of the LP-gas system to ensure a secure and leak-proof connection.

The prohibition of hoses in this specific area helps maintain a higher level of safety, preventing potential gas leaks that could lead to hazardous situations. It also aids in reducing the risk of accidental disconnections or failures that are more likely with flexible components. By enforcing the use of rigid pipe, regulatory standards ensure that the connection between the first-stage and second-stage regulators is robust and reliable.