A siphon is a "dynamic" thing.
Simple shutting the sea water valve will STOP it. After a few minutes, you can reopen the sea cock.
From your picture, the black disc is your check valve.
It SETS closed on pressure
When pressure is stopped {engine stops] the disc should open air flow through your vent to stop the siphon.
Jim...
Simple shutting the sea water valve will STOP it. After a few minutes, you can reopen the sea cock.
From your picture, the black disc is your check valve.
It SETS closed on pressure
When pressure is stopped {engine stops] the disc should open air flow through your vent to stop the siphon.
Jim...