Hkoenig BW1890 Manuel D'utilisation page 7

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BEER KEG SEALANT
All 5 Liter beer keg with the below various appearance sealants can
apply to the beer cooler, however, you should follow the information
as below:
*The sealants with code No. 20 and 21 can be pierced simply by
the cooler piercing pin.
*The sealants with code No. 22 need to be removed off the marking
ring from the sealant and pierce the keg by cooler piercing pin.
(Show as figure 1)