The Mansfield genuine 177-178 biscuit tank lid is an oval shaped porcelain tank cover for the Mansfield tank models 177, and 178. Biscuit is often confused with white, due to the very slight difference in color. Biscuit is often reffered to as an off white, or extremely light tan. This tank lid will have a circular hole in the center of it to install the push button actuator.
