When connecting a new chlorine cylinder, which item must be placed?

When connecting a new chlorine cylinder, it is essential to use a fiber washer. This component plays a critical role in ensuring a proper seal between the cylinder and the equipment it connects to. The fiber washer helps prevent leaks of chlorine gas, which can be hazardous. Using a fiber washer ensures that the connection is both secure and safe, maintaining the integrity of the system.

While other components like a pressure regulator are important for controlling the flow of chlorine gas, they do not directly impact the sealing of the connection. A valve seat is relevant for the operation of valves but does not specifically address the sealing requirement when first attaching a cylinder. An air pump is unrelated to the connection of chlorine cylinders, as it serves different functions, typically associated with aeration rather than gas handling. Thus, the inclusion of a fiber washer is fundamental for maintaining safety and proper functionality in the chlorine delivery system.