H.Koenig BW1880 Manuel D'utilisation page 14

C. Heineken Keg
Heineken kegs are pre-charged with CO2, and do not require the
use of regulator, no need to install the CO2 cartridge. And the knob
on the top cover does not work.
CO2 connector position
Figure 21
1. The Heineken connector that comes with your beer cooler can
work with all Heineken 5 liter kegs. However you must use a flat
head screwdriver to remove the green base from the keg in order to
install the new connector, provided with the beer cooler.
2. When install the new connector to the Heineken keg, you must
firstly install the clear beer tube one end to the connector, one end to
the tap mechanism, then install the connector to the Heineken keg.
Heineken Adaptor
Heineken keg
Figure 22 Figure 23