Seeking stainless steel or otherwise rust resistant rooftop TPRV

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What would you suggest to replace this, on a solar thermal system, San Francisco area:
Capture.JPG

The old one gave out after 40 years in service, and won't reliably close up after it's activated when the system is past capacity at the tank, and stops circulating.
 

Tuttles Revenge

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40 years is a good run. Replace with similar.

Took me a few minutes to realize that the piping wasn't cleverly disguised with "Wood Logs"
 

Fitter30

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They didn't have HT armaflex back in the day but now they do. Has a uv rating and good to 180°c. Wrapped in aluminum should be as wrapped fiberglass.
 
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