Durable Rubber Material: Crafted from rubber, this seal guarantees longevity and durability. Optimal Dimensions: With an outer diameter of 54mm and inner diameter of 28mm, along with outer ring thickness of 2mm and inner ring thickness of 3mm, this gasket provides a perfect fit. Leak Prevention: Designed to create a tight seal between the water tank and the siphon tube, this gasket prevents water leakage. Wide Application: Ideal for use in bathrooms and toilets, this gasket is compatible with most flush valve toilets, ensuring versatility and ease of use in various settings. Pack Convenience: Includes 1pc of the flush valve toilet rubber gasket seal, providing a simple and convenient solution for replacing worn or damaged gaskets. Mat.