Korky 2023BP Universal Flapper for Toto Toilet Repairs, 3", Red KorkyGenuine Toto Flapper, 3 In. - 2478898 This is highly durable This is manufactured in Mexico Maximizes toilet&#039;s original performance Replaces all 3&#034; TOTO toilet flappers:<ul class="a-unordered-list a-vertical"> THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, and THU369S Bacteria, chloramines, chlorine, city water treatment, hard water, well water and rust