I found this somewhat mottled brown glazed wall/floor tube in a bucket of miscellaneous porcelain (non-insulator) items at an antiques mall that was housed in an old converted chicken barn on the way to Bar Harbor yesterday. The tube is about 7-1/8" long, and the unglazed end has an outer diameter of about 2-1/8". The inside is uniform for the whole length at about 1-1/8" inner diameter. I searched the Picture Poster gallery, but couldn't find anything quite like it. It's virtually mint.