What is not recommended when connecting high-pressure sources to fire extinguishers?

Direct charging high-pressure sources to fire extinguishers is not recommended because it can lead to over-pressurization, which may compromise the integrity of the extinguisher. Fire extinguishers are designed to withstand specific pressure levels, and introducing high-pressure gas directly can exceed those limits, potentially causing a rupture or failure. Additionally, improper connections might lead to leakage or contamination, which could render the extinguisher ineffective in an emergency situation.

In contrast, using a pressure-relief valve is an essential safety feature that ensures any excess pressure is released safely, preventing damage to the extinguisher. Conducting regular inspections is critical to maintaining the functionality and readiness of the extinguisher, ensuring it will operate effectively when needed. Utilizing approved fittings is also important for safe and reliable connections, minimizing the risk of leaks and ensuring that the extinguisher functions properly.