Kit contents: 2 x flanges (17 mm), 2 x duckbill valves, 2 x backflow guards, 2 x tubes, 2 x bottles (with one-piece travel cap). Works with Spectra S2, Spectra S1, Spectra 9 Plus Breast Pump. Dome caps and caps are not included in this kit All pump parts are manufactured by Maymom. This is not an original Spectra S2 accessory. This is not an original Spectra S1 accessory. Non-Original Spectra Pump Parts Compatible and interchangeable with Spectra pump parts. Same suction power as the original parts. Replace Spectra flanges, Spectra duckbill valves, Spectra discharge protectors, Spectra tubes, Spectra bottles (wide opening). Various flange sizes available: 15mm, 17mm, 19mm, 21mm, 24mm, 25mm, 27mm, 28mm, 30mm, 32mm The one-piece cap of the Maymom bottle includes a sealing ring for secure closure. No waste of milk. Designed for travel and storage of formula or breast milk. It is also perfect for converting the bottle into a snack container or a tumbler for mom The material does not contain BPA. Can be cleaned with steam, boiling water or microwave steam bags. Meets FDA regulations for plastic materials that come into contact with food. Ce produit est fabriqué par Maymom pour s'adapter aux pompes Spectra S1/S2 en plus des pompes Spectra 9 et Spectra M.