Replacement CO2 bulb / capsule seal for the

ASG CZ P-09 CO2 air pistol.

Fits the version with this magazine:

This is the seal against which the CO2 capsule fits and the most common to be replaced.
Generally needs to be replaced if a CO2 capsule has been left in the airgun for a long time, which causes leaks when the CO2 is replaced.

The most common cause of leaks on these pistols.