This item is SKU 2590 rear vent adapter for Alaska Coal stoves - stoker stoves. Some of the older Alaska stoker stoves do not fit directly to regular 6" stove pipe. This item is galvanized pipe and measures 11" long and 6.25" Approx OD on one end and 5.75" Approx OD on the other end.
Easy way to hook up those older Coal stoves!!