Telescoping pipe has gap

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Here's a few
 

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Single wall pipe? I hope?
 
Yes. So I guess from the non response it's nothing to be concerned about?

That’s normal. The big pipe has to be bigger than the inner pipe to allow it to telescope.
 
long as you dont get smoke leaking thru it i wouldnt be concerned
 
Air leakage into the pipe can dilute draft and cool down the flue gases. This can cause increased creosote production and weaker draft. In a marginal draft situation, it can be responsible for poor stove performance.
 
Air leakage into the pipe can dilute draft and cool down the flue gases. This can cause increased creosote production and weaker draft. In a marginal draft situation, it can be responsible for poor stove performance.
very good point Sensei
 
What brand of pipe? Some are considerably more true/round than others and have a much better fit
It's all Dura Tech components. I have a 1' left over part that if it becomes an issue, I can put the one ft. pipe coming out of the top of the stove and untimately telescope it further in 1 ft.
 
Air leakage into the pipe can dilute draft and cool down the flue gases. This can cause increased creosote production and weaker draft. In a marginal draft situation, it can be responsible for poor stove performance.
As far as draft goes there are no turns in the pipe, it's a straight run all the way up.
Is there any product used in a situation like this to seal it off?
Being that it's Dura Tech I would have thought the quality would have been sufficient.