Lasco 4.7"x2.9"x2.1" Black Rubber Fit-All Toilet Tank Flapper with Stainless Steel Chain. This flapper is designed to fit regular Douglas type flush valves, Crane fixtures without overflow tubes, and style plastic flush valves with projecting posts. It's made of durable rubber and comes with a stainless steel chain for long-lasting performance. The flapper can be easily installed over the overflow tube or cut to fit over the post of the flush valve, ensuring a secure and leak-free seal.