1、Compatible Models: Our breastpump accessory features 6 replaceable duckbill valves and 2 replaceable backflow protectors for S2, for S1, for 9 Plus, for Dew 350 breastpumps. Good compatibility is convenient for new moms to use. 2、Same Suction Power as Original: Our replaceable duckbill valves and backflow protectors provide the same suction power as original breastpump parts.With consistent suction power, you can maintain optimal efficiency and performance for your pumping sessions 3、Easy to Install and Remove: The uniquely designed duckbill valve has an easy to grip pull piece that makes it easy to remove and replace the duckbill valve, saving you time and effort during your pumping routine. 4、Easy to Clean: Wash the valve and backflow protector with warm soapy water and rinse well after each use. Our breastpump accessories are dishwasher secure.Cleaning and maintaining your breastpump accessories is easy with our replacement parts. 5、Premium Material: Breastpump accessory is made of premium liquid silicone for secure and reliable quality. Can be cleaned by boiling water.It is very convenient for new moms to clean and maintain on a daily routine.