So if you look at the pic of my stove set up you will see where the stove pipe connects to top of stove. I had to replace the straight piece as it got scratched up. When I put the replacement pipe in everything looked good until I stared a fire. I just happened to notice a small sliver of opening where the new piece connects into the reducer. The fire burned okay and if anything air was getting sucked in a nothing getting out - again its not a big gap just a very tiny one. Should it be airtight. They are sending me a new piece but I was wondering if its a big deal