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then you plug a bit of rubber hose into the end of it held onto a fitting with a jubilee clip.... What happens if a hose comes off the fitting, you get a big hiss untill you fire the connector out of the quick release.
We've just had a new air ring main installed with 1½" hose drops fitted, when one blew off I had to wear ear defenders to get near it to shut it off - very BIG hiss!