Stainless T discoloration

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This is my brand new T after two or three hot fire with the bypass open for about 15 minutes - stovetop never got over 250F.
The orange stuff at the joint is a failed attempt at using High Temp silicon.

View attachment 155119
is that a double wall tee 6 id 8 od or such kinda like metalbest or such ? maybe not looks screwed together
 
Why did you think you needed RTV?

The RTV was not necessary.I did a flame test with a match and thought I detected a minor leak sucking in the flame. Next time the RTV falls off it stays off.

It's single wall 6" standard pipe.
 
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