What are the differences in flapper materials ?

There are three common materials on the market: PVC, rubber, and ABS.

PVC flappers have a significant price advantage over other materials, making them widely used in the market. However, prolonged immersion in water can cause PVC to shrink, potentially leading to minor leaks in the flush valve. Therefore, regular inspection and timely replacement of leaking flappers are necessary.

Rubber flappers are much more stable in water and do not deform easily, but they come at a higher cost.

ABS flappers are the most durable option, with their sealing function primarily relying on a silicone gasket attached to the flapper. The advantage is that if an issue arises, there is no need to replace the entire flapper—only the worn-out silicone gasket needs to be changed, making maintenance more convenient.