1.High-quality Silicone Material: O-ring made from high-quality silicone, compatible with TOTO silicone gaskets. 2.Precise Dimensions: Flush valve gasket with an outer diameter of 3.54 inches (90mm) and an inner diameter of 1.38 inches (35mm), designed to fit TOTO 3-inch flush valves. 3.Compatible with TOTO: Sealing washer specifically designed to be compatible with TOTO THU128 3-inch flush valves, ensuring seamless replacement. 4.Superior Sealing Performance: The sealing ring provides strong sealing, ensuring long-lasting, leak-free use. 5.Purchase Reminder: Please measure your flush valve dimensions to confirm compatibility before purchasing. This 4-pack of silicone seal gaskets and washers is designed to be compatible with TOTO THU128 3-inch flush valves. Made of high-quality silicone, Made of high-quality silicone, it perfectly fits TOTO silicone gaskets. The outer diameter is 3.54 inches (90mm), and the inner diameter is 1.38 inches (35mm). Suitable for TOTO 3-inch flush valves, please remind customers to measure their flush valve dimensions before purchasing. If the dimensions match, you can buy with confidence. This gasket offers excellent sealing performance, long durability, and superior quality, making it an ideal replacement repair parts kit.