Posts in Fire extinguisher

When we bought this house there was a fire extinguisher on the wall. I had never really looked at it, I just put our fire blanket above it and left it. I took a look at it today for some reason. It’s probably not fit for purpose, and since I’d hate to actually use one of these indoors, particularly in my own home, so I shall get rid of it. I’ll likely let it off then see if I can use the canister as a compressed air cylinder on the land rover. The locking diff doesn’t not require very many liters of air to operate so this would be way more efficient. Thought I’ll likely leave the other tank in there but perhaps valve it.