This duckbill adapter replacement is specially designed for Model 503, ensuring seamless compatibility with various toilet systems. The flexible silicone materials allows for easy installation without additional tools, perfect for enthusiasts. Made from good silicone, this adapter excellent wear resistance and properties. It maintain superior sealing even with frequent use, reducing leakage risks for bathroom protecting. The unique structural design effectively reduces flushing noise, ensuring undisturbed use at any time. Ideal for households with or elderly family members, enhancing living comfortable. Optimized flows control helps reduce water consumption per flush while maintaining strong flushing power. Perfect for users looking to living and lower water bill. Package includes: 01:8pcs Duckbill adapter replacement 02:16pcs Duckbill adapter replacement