Magic Chef Vissani MCKC490S - Manual (Page 10)

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Below are actual pictures of the coupler assembly, whole and somewhat broken down
Above: Assembled Coupler, ready for installation. In this image,
the handle is in the down position. If you look at the very bottom
of the coupler, you can see the probe in the down position. This
is the part that breaks the seal on the keg, allowing air in and beer
to flow out.
Below: Basic breakdown of coupler. The parts that are not
attached are all removable and changeable. They are all
required, in the order and direction shown, for proper operation of
the unit.