Korky Plus, Classic Flapper, Designed To Stay Open Longer To Fit Old 5 & 7 Gallons Per Flush Toilet Models, Flapper Collar Allows For Attachment To Brass Flush Valves & Can Be Removed To Fit Plastic Flush Valves, Exclusive Longest Lasting Red Rubber Resists Chlorine, Bacteria, City Water Treatment, Hard Water, & Well Water, Made Of Flexible Rubber For A Tight Seal & Easy To Install, Includes: (1) Flapper & (1) Stainless Steel Chain.