Hkoenig BW1890 Manuel D'utilisation page 8

*The difference between code No 23 and 24 is the safety clasp
quantity. Pull up the safety clasp carefully, turn around and take it
out from the keg; replaced it by the sealant (like code No 20
sealant) provided in the beer cooler, attach it to the beer keg, and
pierce it by cooler piercing pin. (Show as Figure 3).
Important: Before replacing the sealants or piercing the cooler kit,
you must always follow the instructions marked on the keg to
eliminate the excess gas and ensure that the keg has rested long
enough to avoid foam coming out through the cooler piercing pin
/tap faucet. And it is no need to release the gas and replace the
seal rubber if you use Heineken keg, because Heineken keg has its
own CO2 pressure inside, and no need to be provided from outer
CO2 pressure system.
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Figure 1
Figure 2