Leaking Water cylinder, behind anti corrosion system

[cotswoldmark]

Hi - I have a plumber booked in to look at this, but I would also like to understand myself what is causing the issue we have. We have a slow drip of water coming from behind the anticorrosion unit on our Ariston unvented water cylinder. The pink "nozzle" behind the Protech unit appears to be corroded and broken. Attaching some photos too.
If it helps, the label at the foot of the cylinder shows the model as "CONTRACT STI 210 INDIRECT PROTECH"

Any advice greatly appreciated.

 

[ShaunCorbs]

It’s an electric anode new unvented cylinder time

 

[cotswoldmark]

It’s an electric anode new unvented cylinder time

Thanks! Does this mean that we need a new anode or a new cylinder?

 

[ShaunCorbs]

Thanks! Does this mean that we need a new anode or a new cylinder?

Depends if it’s a serviceable item I don’t think it is