Hardi ALPHA EVO EcoDrive DELTA FORCE 5100 Instruction Book page 175

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.
6 - Maintenance
175