We often get calls from customers looking to replace or add to their existing double or triple wall factory built chimney pipe. These products do not mix and match. Each manufacturer has it's own engineers and patents for their product who design the chimneys, and they are not universal (possibly on purpose). You really need to find the manufacturer and model and try to find a dealer or use a "Google" search to locate similar parts if they are uncommon.

We also hear a lot of someone trying to use a double or triple wall chimney product they have in their possession to hook up a wood stove. Any chimney pipe to be used for an actual wood stove needs to have insulation around the inner most wall to be proper and safe. .........