I just recently purchased a older Appalachian 32. It has a oval hook up on top and I can seem to find anything to fit. The tag on the back says to you only 8" pipe. I tryed to use a pice of black stove pipe and oval it to fit. The smaller end would fit but didn't seal well the lager end would not fit at all. Do I need to purchase a adapter if so shoot me in the direction. Any suggestions and all help is appreciated. I will be useing 8" liner. Thanks