✅ Content 4 piece duckbills and 2 piece membrane. Compatible with Momcozy M5 wearable breast pump, compatible with Momcozy V1 / V2 hands free breast pump. Built to last longer than other pump parts. ✅ The duckbill design prevents leaks and backflow. Membranes are produced strictly according to professional standards, the stronger suction draws out more milk. ✅ Made by Durceler. Not original Momcozy pump parts. Work with Momcozy accessories. ✅ SAME suction power as OEM valves. Replace silicone membrane, duckbill valve regularly to optimize the performance of your breastpump. ✅ DO NOT contain BPA. Clean in water steam or boiling water before use. Tested by independent labs for quality and safety. All items packaged in retail pack, sealed by manufacturer Durceler. Accessories Compatible with Momcozy M5 Wearable Breast Pump, Made by Durceler, Not Original Momcozy Parts.