Quick connect 1/4″ tubing to 7/16″ female UNS filter tap thread or the connection thread at the back of some fridges.7/16″ = 11mm. Most water filter taps have a 7/16″ UNS thread and most fridges also have this thread.
The male thread that this screws onto measures about 12mm across.
These fittings will connect to John Guest 1/4″ plastic tubing or 1/4″copper pipe.
CI3208U7S , AFAU047/16CW