At first, I brought Selkirk pipes from Menards but I ran into problem putting it all together because my stove will be installed in the basement. I wanted to connect it to bricked clay-lined chimney where the wood stove was previously connected to. The 8" chimney nimble is above the pellet stove so I got an 3 to 8 inch adapter which fit tightly into the brick nimble. I plan just to use high temp silicon seal around the nimble to keep it in place without using any other fasteners. The issue I ran into after adding a vertical adapter to the stove, the 36" Selkirk pipe is exactly the same length from the top fo the stove vertical adapter (factory adapter) to the 90 degree elbow that is connected to the nimble adapter and I couldn't fit Selkirk connector between it since it will need an extra 2" space for it. To use the Selkirk connector, the pipe need to be at 34 1/2" in length so I thought I would try to get a smaller pipe and use an adjustable extender but Selkirk doesn't sell black pipe in 24 inches and the extender only add up to 10 1/2 inches more so it would be just being right on the dot with a 24" pipe to get 34 1/2" and if I need an inch or more then I would be out of luck. Instead, I decided to take all the Selkirk pipes back to store and pay more for the Duravent pipes since I can get 24" pipe in black and an 18" extender pipe that add up to 16" so still room to adjust if needed without being on the borderline. My question with the Duravent, since it have interlocking feature and a silicone gasket so I will not need to use any sealants or foil tape with it? The 3 to 8 Selkirk adapter does not have any interlocking at all just a 3 inch pipe which the Selkirk just slide right onto it so I assume Duravent will be the same. Do I just use a silicone seal around the adapter pipe and slide the Duravent pipe onto it? Will I need to use two stainless screw to keep it on or the seal should keep it on? This is what the nimble adapter look like https://express.google.com/u/0/product/7954333917336498548_7523157769645081524_7820913?utm_source=google_shopping&utm_medium=tu_cu&utm_content=eid-lsjeuxoeqt>im=CJLpt5q5xI_66gEQnIXv3rW6mtLDARjQzdMVIgNVU0Qo8K7Q5AUw8azdAw&utm_campaign=7820913&gclid=Cj0KCQjwsZ3kBRCnARIsAIuAV_SHilsY7UzC_J4CrK8c1o6AJ-95ElXM9nyH5acK-4i6_1FFXCbZ_vwaAuelEALw_wcB Any feedback are welcomed! Thank you!