What must be installed if an oil line passes through a wall?

When an oil line passes through a wall, a Firomatic valve must be installed as a safety feature. This valve is designed to automatically shut off the flow of oil in the event of a fire or other emergency conditions. Its presence is crucial as it helps prevent fuel leaks that could lead to fires or other hazardous situations.

The Firomatic valve is especially important in situations where an oil line crosses a barrier between different areas, since this area could be susceptible to fire. The valve will stop the flow of oil when it detects excessive heat, thus serving as an essential safety measure in protection against fuel-related incidents.

While other types of valves, such as check valves, shut-off valves, or drain valves, have their specific applications, they do not fulfill the same safety role of automatically shutting off fuel flow in the event of fire. Each of these other valves serves different purposes, such as preventing backflow (check valve), manually controlling flow (shut-off valve), or draining the line for maintenance purposes (drain valve), but none of them provide the same level of fire safety as a Firomatic valve does when an oil line penetrates a wall.