What must be replaced when connecting a new chlorine cylinder?

When connecting a new chlorine cylinder, it is essential to replace the lead washer. The lead washer serves a critical function: it provides a proper seal between the chlorine cylinder and the regulator, ensuring that no gas escapes during the transfer. Chlorine is a highly reactive and hazardous substance; thus, maintaining an effective seal is crucial for safety and preventing leaks.

Over time, a lead washer can become worn or damaged, which may compromise its ability to form an airtight seal. Replacing it when installing a new cylinder helps ensure that the connection remains safe and effective.

Other materials mentioned, such as rubber gaskets, nylon seals, and metal O-rings, have their specific uses in various types of connections and systems. However, in the context of connecting a chlorine cylinder specifically, the lead washer is the correct component that must be replaced to maintain safety and functionality.