What should be done to the extinguishing unit after use?

• A. No action required; it's still ready.
• B. The unit should be considered discharged, replaced or refilled, and inspected by a qualified technician before reuse.
• C. Only the gauge needs to be checked before reuse.
• D. The extinguisher should be sent to the manufacturer for service.

Answer: (B)

After use, the extinguishing unit has been discharged and its contents and pressure are no longer reliable for safe operation. It should be treated as discharged and either replaced or refilled, then inspected by a qualified technician before reuse. A professional will verify that the correct extinguishing agent is present, restore or confirm the proper pressure, check the cylinder, valve, seals, and tamper seals, and perform any required testing to ensure the unit will function correctly if needed again. Merely relying on a gauge check or sending it for service without the proper recharge and thorough inspection can leave the extinguisher unsafe or ineffective. So the correct action is to have it replaced or recharged and professionally inspected before putting it back into service.