Hardi MEGA VPZ NK Original Instruction Book page 139

6 - Maintenance
Gasket Types
Usually an O-ring is used, but there is also a different type of gasket in
use (F).
How To Remove Lock Ring
If the lock ring needs to be replaced, this can be done by mounting a
connector (A) in reverse direction.
Push the connector over the lock ring.
Place the connector right behind the lock ring and pull to remove the
lock ring from the pipe.
139