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No. LetterAgent's labels are Canada Post Xpresspost parcels under five kilograms, and a fire extinguisher is a pressurized vessel that Canada Post will not carry. This is the moving-house version of the question, so here is the honest answer and what movers actually do.
Because it is a pressure vessel. Canada Post's dangerous-goods index lists fire extinguishers under Class 2 (compressed gases), the same family as propane cylinders and aerosol cans. A typical home extinguisher holds dry chemical powder under nitrogen pressure; drop it hard enough and the valve can break or discharge, filling a confined truck with a fine powder cloud. Dry chemical powder is also corrosive to electronics, so a discharge inside a parcel van ruins everything electronic in the vicinity. The device's job is to fight fires, but in transit it is simply pressurized.
| Situation | What changes |
|---|---|
| Small kitchen extinguisher | Nothing: small ones are still pressurized vessels under the rules |
| Partially used (discharged once) | Pressure may be lower, but carriers still classify it as pressurized |
| Pressure gauge in the green zone | Means it is ready to use: fully pressurized, same restrictions |
| Very old extinguisher | Often more worrying: corroded cylinders are weaker and less predictable |
The gauge detail confuses people. A needle in the green zone means the extinguisher is charged and ready, which is exactly what makes it restricted in the mail. And age matters in the other direction: old extinguishers with rusty cylinders are the ones most likely to fail physically, not least likely.
Most people leave them behind and buy new ones. A home fire extinguisher is cheap compared to the hassle of moving a pressurized vessel, and fire safety guidance says an extinguisher that has been discharged, is past its service life, or has a gauge out of the green zone should be replaced anyway. So the question "how do I ship my extinguisher" usually resolves into "just buy a new one at the new place," which costs less than any legal way to transport the old one. If you must move one across town, the safe move is personal transport: upright, secured so it cannot tip, never in a hot trunk for hours, with the pin and tamper seal intact so the trigger cannot be bumped.
In principle, yes: small compressed-gas articles move through licensed dangerous-goods carriers under the right classification and packaging. In practice, nobody does this for a household extinguisher, because the cost dwarfs the price of a new one. Fire equipment service companies move them in bulk as part of their trade, with training and paperwork. A consumer mailing one extinguisher to another person does not fit that machinery, and a consumer parcel label (Canada Post, USPS, UPS, FedEx) will refuse it.
Professional moving companies generally refuse them. Mover tariff rules treat pressurized vessels as restricted items that stay out of the truck, alongside propane tanks and aerosol cases. When customers ask, the standard advice is the same as here: leave it, buy new at the destination. Some movers will carry an extinguisher in the cab of the truck for fire safety purposes (their own, for the vehicle), but that is not the same as moving your kitchen extinguisher as household goods.
Technically, a fully discharged extinguisher is an empty steel shell. Practically, this is a bad plan: discharging a dry chemical extinguisher in your garage creates a corrosive dust cloud that damages cars, tools, and electronics in the vicinity, and the cleanup is miserable. You would also have to be certain it is fully discharged, which is hard to verify on a gauge alone. The whole exercise trades a simple "buy a new one" for a messy discharge event. Nobody in the fire-safety world recommends this route.
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