Hightank toilet Tank liner, drilled, 4″ from front, both flush and fill are in line. Liner measures 16 1/2″ wide, 9″ tall, and 8″ deep, outside dimensions. See gallery photo for hole location. Flush valve hole is 2 7/16″ diameter. Fill valve hole is 7/8″ diameter. From center of large hole to center of small hole is 6″.