Here’s a rare one. We’ve located a stash of old feather washers for the antique Cast iron Syphon type flush valves. If you have a pre-1900 hightank toilet that has a large lump of cast iron that gets lifted to flush, this MIGHT be your gasket. There are other sizes that were made, be sure to check dimensions. This washer has an OD of 2 3/4″, and the ID is 1 3/8″. Sold by the each, best goes first. VERY LIMITED supply.