CONTENTS: 2x Backflow Protector (including 2 large caps, 2 small caps, and 2 silicone diaphragms.) 6x duckbill valve and 2 x silicone membrane and 2x tube. Maymom pump parts can replace Spectra backflow protector, Spectra duckbill valve, Spectra tubing, Spectra membrane. Not original spectra pump parts. Not original Spectra S2 PLUS, or Spectra S1 PLUS, Spectra S3 pump parts. | COMPATIBLE with Spectra S1 Spectra S2 Spectra S3 Spectra 9 Plus breast pump (The duckbill valves also compatible with Spectra Dew 350). See photo illustrations for compatible breastpumps. Not original Spectra S1 accessories, Spectra S2 accessories, Spectra S3 accessories, Spectra Duckbill Valves, Spectra Membranes. | SAME SUCTION POWER AS OEM PARTS. Maymom duckbill valves are compatible with Spectra Flange and Maymom flange. Maymom silicone membranes are compatible with Maymom backflow protector (Long, Short and Medium) and Spectra S1 backflow protectors, Spectra S2 backflow protector. Also suitable for Ameda Mya pumps. It does not fit the old version of spectra backflow protector; see photo for details. The tubing is also suitable for Ameda Mya Portable and Ameda Mya Pro pumps. | CLOSED SYSTEM: With Maymom backflow protectors, no milk will enter the tubing, so the tubing will remain clean. The breastpump parts can be cleaned with water steam or boiling water. | BPA/DEHP FREE. IN RETAIL PACK. Comply with EU and FDA regulations for plastic materials that contact food. Test reports are conducted by independent lab and available for reference. All items packaged in retail pack, sealed by manufacturer Maymom.