What must be removed from the container before transportation?

In the context of transporting fuel-oil containers, it is crucial to ensure that all components that could potentially cause leaks or safety hazards are properly managed. The regulator must be removed from the container before transportation primarily because it is a control device that can vary the pressure of the gas or fuel flowing through the system. If left attached, it could inadvertently open or malfunction during transport, leading to dangerous leaks or spills.

Additionally, by removing the regulator, you reduce the risk of contamination and ensure that the container complies with safety regulations that govern the transportation of hazardous materials. This practice helps maintain the integrity of the fuel and the safety of those handling the containers.

In contrast, while caps, valves, and filters serve important functions in fuel systems, they do not pose the same level of immediate risk in terms of pressure control or leakage as a regulator does when transit begins. Therefore, the safe removal of the regulator is a critical step in preparing a fuel-oil container for transportation.