What You Get: 2x backflow protectors (including 2 large caps, 2 small caps, and 2 silicone diaphragms.) and 6x duckbills. Maymom backflow protector can replace Spectra backflow protector, both new and old versions. Maymom duckbill valve can replace Spectra duckbill valve. Not original spectra pump parts. Not original Spectra S2 PLUS, or Spectra S1 PLUS, Spectra S3 pump parts.