SANEI Rubber Stopper for Bathtub, W-Type, for 43mm Drain, Double Seal, Without Chain, Replacement H29F-43 【Double Seal for Secure Water Stop】Double water seal effect with the rubber stopper side and the top lid. It adheres to the top and inside of the drain to stop water. Soft rubber is used on the side of the rubber stopper, fitting the drain. I have a few other sizes. I bought it at Kohnan. I have extras. I'm giving it away because I don't need it.