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Colin, I used to get this a lot with the Jetstream 1st Stages.
The 'plug' you describe is actaually an over pressure relief valve. Under the allen key is a spring and rubber seal affair. This is just another protection built-in to the system.

As you are probably aware, the Jetstream hose also has a o/p device on the end of the hose crimp. The Cycklon is a downstream valve anyway.

I digress....

The most likely cause of this is the 1st stage main valve and h.p. seat not sealing, thus causing a gradual 'creep' on the Interstage Pressure.

Either a service by a good Poseidon Technician, do as I did with my 6 sets - SELL THEM!!!

Regards



Enzo
 
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