Spectra's innovative design technology ensures that all Spectra breast pumps have backflow protection for hygienic, safe pumping. This backflow protector creates a complete physical barrier between your milk and the pump motor, ensuring that your milk is protected and that pump performance is maintained. This backflow protector is suitable for use with the following breast pumps: Spectra S1 Spectra S2 Spectra 9 Plus Dual Series Pumps Please note that the backflow protectors are sold singly, so please add 2 to your order if you are double pumping. Your backflow protectors should be changed every 6 months, or when you notice damage to the silicone diaphragm on the inside of the backflow protector. This is a whole backflow protector component, so includes the casing and diaphragm.
