Features: 1. Healthy material: This duckbill valve is made of food grade silicone material, which will not pollute your breast milk. 2. Wide range of applications: inner diameter 19mm/0.74in, outer diameter 25.3mm/0.99in, as long as the inner diameter is suitable for your breast pump, it is suitable for most breast pumps in the market. 3. Anti-deformation design: air check valve, it can effectively absorb breast milk with the intelligent host adjustment frequency. 4. Durable: durable and long-lasting. 5. Cleaning and disinfection: It is recommended to disinfect before and after each use. Duckbill valves only, other accessories shown in the picture are not included. Specification: Material: Silicone Size: approx. 2.53x3.1x1.9cm / 0.99x1.22x0.74in (detail size please see the pictures) Color: Transparent Quantity: 5 pcs Note: No retail packaging. Please allow 0-1cm error due to manual measurement. Please make sure you do not mind before purchasing. Due to differences between monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 5 pcs x Duckbill Valves