How to use this John Guest reducer

The socket is 15mm and the plain end is 22mm which will need to go into a 22mm fitting.
 
One of the advantages of a "key" disconnect fitting is that there's no fear of the fitting self-disconnecting if it gets caught against a joist or some other obstruction
 
One of the advantages of a "key" disconnect fitting is that there's no fear of the fitting self-disconnecting if it gets caught against a joist or some other obstruction
speedfit fittings can't disconnect just like that if properly inserted. I've tried and it's very hard. You can also lock it into place. For fittings that have been there for a while, I even struggle to undo them. Can't imagine them getting undone even by pulling on the pipe.
 
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