Normally extinguisher systems are plumbed in with connections which are released by pushing a plastic or chrome plated collar which sits over the tube where it goes into a connection. Push the collar towards the connection and then pull the pipe away from the connection. That part can be a bit tricky, someone had to show me how before I could make it work.
As the Evil one says, there must be a pin or a hole to put a pin into somewhere, I haven't met that type, but I can't imagine a system without one. Don't forget to take the pin out if you do use it again, the scrutineers get wildly exited if you present a car with the extinguisher pin still in, and even more so if they find it in as you come back off track.
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