Come and take a look at the heat exchanger
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Talk about what those rivets on the heat exchanger tube bundle are, and what material the two metal blocks in the head tube box are made of and what purpose they serve.
The rivet is sealed, but this pipe is leaking. The two metal blocks in the head tube box are likely anti-corrosion plates.
Let’s talk about the materials used for Metal Fast – why such materials are chosen.
Plug, used for repairing leaks in tube bundles; anodic protection version
The metal block sacrifices itself to protect the heat exchanger; it is usually a magnesium block
That’s a plug, used to seal leaks. Those two pieces should be sacrificial anodes or cathodic protection
There was a leak in the tube, and the leak was sealed by sacrificing anode plates – magnesium, aluminum, or zinc