Prototyped directly from the a print of the oven ascension columns at J&L Steel, this part is a must for upgrading your Walthers Coke Battery, or scratch building your own. These ascension columns were the conduit for the gases and tar from the oven itself to the collecting main. Designed to be used in place of the Walthers “elbow” that represents the ascension column. Not for use with Walthers collecting main. Select N, HO or S.