Spectra Backflow Protector
Backflow protectors should be changed out every 2-3 months. Inspect the silicone membrane often for warping and cracks, or just poor fit, and replace if needed.
Have extras on hand, especially if returning to work and pumping frequently.
Replacement Backflow Protector. For use with the Spectra S1, S2, and 9Plus breast pumps.
One (1) Spectra Backflow Protector. Includes silicone membrane, uppercase, and lowercase.
If you are double pumping, you will require two.