This Vylon Cellular pipe is ideal for manhole chimney rebuild liner use. It is incredibly strong and relatively lightweight. Its approximately one-inch wall thickness is perfect for the Mr. Manhole sealant to bond to ensure a reliable seal of the liner to the manhole frame at the top and the manhole cone at the bottom. The material ships in convenient 40.5″ lengths, and in two common diameters, 27″ and 30″. Special sizes are available upon request.