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Hi insure, the bubbling is from an area below the valve housing, close to one of the bolt holes. After careful inspection, there are 3 small and light "scratches" there. Turns out they are prob hairline cracks. Very hard to see and bubbles only when the water temp goes beyond 80 degrees C. The tank is toast, got that changed yesterday. Guess it's better to discover the prob now when I'm monitoring the breather valve than the tank letting go in the middle of the highway.
Btw my Porsche original O rings are really round not square.
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