DURABLE AND TIGHT SEAL:Toilet flapper replacement kit is made of high quality chlorine resistant rubber that is guaranteed to last for a long time and is unaffected by hard water WIDE COMPATIBILITY:Adjustable flapper fits most 2-inch flush valve toilets and is ideal for use in high efficiency 1.28 to 3.5 gallons per flush toilets，but not limited to American Standard, Kohler, TOTO, Mansfield, Gerber SAVE WATER AND MONEY: Fixes leaky flapper, runnig toilet, double flush, worn toilet flapper. Best replacement for the old, leaky flappers. Effectively control flushing to conserve water over the long term, reducing bills while maintaining environmental consciousness Easy to Install:Simply loosen the clips of the old flapper, clip the new toilet stopper flapper down in its place, and attach the chain - no tools required! Upgrade your toilet's performance with ease.(Make sure you measure the opening in your toilet tank. This one is for the small 2" opening QUALITY SERVICE: We are committed to providing high quality toilet flapper replacement and excellent service. If you are not satisfied with the product or have other questions, you can contact us, we will give you a satisfactory answer within 24 hours