[Specific Compatibility]: These duckbill valves are compatible with Elvie Stride Breast Pump and are not compatible with Elvie Double, Single, or original Wearable pumps. They are also compatible with Momcozy, TSRETE Wearable Pumps Cup, and Spectra CaraCup. [No-Gap, Same Suction Power as Original]: Duckbill valves feature no gap on valve tips, providing the same suction power as original pump parts. The silicone duckbill valve is designed to prevent back-flow of breast milk and helps drain milk completely into the container without loss of suction. [Premium Material]: These replacement pump parts are made of food-grade silicone material, BPA-free, soft, odorless, durable, leak-proof, and skin-friendly for both mother and baby. [Easy to Clean]: Wash duckbill valves and diaphragm after each use with warm soapy water and rinse thoroughly. Sterilize by boiling or steaming at a temperature not exceeding 100C (212F) for 510 minutes. Avoid using hard brushes; clean with fingertips instead. Color: Green Material: Silicone Package Contents: 4 x Duckbill Valves Note: The package includes only the items listed above. Other products are not included. Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by 13 cm.