We are sorry to hear your frustration. We recommend the 100CM Korky Ultra 2 in. Toilet Tank Flapper (Home Depot part number: 420456). It is designed for for all toilets including, 1.28, 1.6, 3.5, and 5+ gallon per flush tanks. Would you be willing to contact our customer service team? We would like to learn more about your toilet and quickly identify a solution. Please dial 1-800-528-3553 or email us at sales@lavelle.com. We are available Monday through Friday, 7:30 AM to 5:00 PM CST. Your Korky flapper is backed by a 5 year warranty and we want to ensure your 100% satisfaction.