2 GENERIC BACKFLOW PROTECTORS Use with SPECTRA S1, SPECTRA S2, SPECTRA 9PLUS Breastpump. Including 2 Large Cases, 2 Small Cases, and 2 Silicone Diaphragms. Replacement for Spectra Backflow Protectors.nMADE BY NENESUPPLY. NOT ORIGINAL SPECTRA PARTS. Materials do not contain any BPA, and can be sanitized with boiling water or water steam.nCLOSED SYSTEM. No contact between milk and tubing, which minimizes mold growing and protects your pump motor.nFDA REGISTERED MEDICAL DEVICE. Comply with EU Commission Regulation (EU) No 10/2011 for plastic materials that contact food.nIN RETAIL PACK sealed by manufacturer for best protection and hygiene. Every batch is tested by independent labs for safety.nCOMPLETE RANGE of GENERIC AFTERMARKET PUMP PARTS for SPECTRA:Nenesupply makes complete range of aftermarket compatible pump parts for Spectra. Including Flange, Duckbill Valve, Backflow Protector (Short end and Long end), Tubing, Collection Bottles (Wide Mouth and Narrow Mouth, Breastshield converter. All available on Amazon.com. TRUSTED BRAND: Nenesupply makes high quality compatible breastpump parts for Medela, Spectra, Ameda, and Avent breastpumps. Buy with confidence!