![Amazon.com : Maymom Backflow Protector, Long Stem, Compatible with Spectra S1, S2 and 9 Pumps, Compatible with Medela Flanges and Medela Parts; 2pc : Baby Amazon.com : Maymom Backflow Protector, Long Stem, Compatible with Spectra S1, S2 and 9 Pumps, Compatible with Medela Flanges and Medela Parts; 2pc : Baby](https://m.media-amazon.com/images/I/513wVn82qeL.jpg)
Amazon.com : Maymom Backflow Protector, Long Stem, Compatible with Spectra S1, S2 and 9 Pumps, Compatible with Medela Flanges and Medela Parts; 2pc : Baby
![Amazon.com : PumpMom Backflow Protector and Tubing, Replacement Breast Pump Parts for Spectra S1 Spectra S2 Spectra 9 Plus (Not Original Spectra S2 Accessories) : Baby Amazon.com : PumpMom Backflow Protector and Tubing, Replacement Breast Pump Parts for Spectra S1 Spectra S2 Spectra 9 Plus (Not Original Spectra S2 Accessories) : Baby](https://m.media-amazon.com/images/I/61xiCviCHCL._AC_UF350,350_QL80_.jpg)
Amazon.com : PumpMom Backflow Protector and Tubing, Replacement Breast Pump Parts for Spectra S1 Spectra S2 Spectra 9 Plus (Not Original Spectra S2 Accessories) : Baby
![Maymom Pump Parts Compatible with Spectra S2 Spectra S1, incl 21mm Flange Valve Tube Bottle Backflow Protector [S001W-F21.5in1B] - US$20.00 : Maymom Wholesale Shopping Cart Maymom Pump Parts Compatible with Spectra S2 Spectra S1, incl 21mm Flange Valve Tube Bottle Backflow Protector [S001W-F21.5in1B] - US$20.00 : Maymom Wholesale Shopping Cart](https://www.maymom.com/eshop/images/Main-21mm-02.jpg)
Maymom Pump Parts Compatible with Spectra S2 Spectra S1, incl 21mm Flange Valve Tube Bottle Backflow Protector [S001W-F21.5in1B] - US$20.00 : Maymom Wholesale Shopping Cart
![Amazon.com : Spectra - Backflow Protector Replacement Part for Breast Milk Pump - Breastfeeding Support Essential - Compatible with Spectra Breast Pumps : Baby Amazon.com : Spectra - Backflow Protector Replacement Part for Breast Milk Pump - Breastfeeding Support Essential - Compatible with Spectra Breast Pumps : Baby](https://m.media-amazon.com/images/I/713-OlpJ6ZL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : Spectra - Backflow Protector Replacement Part for Breast Milk Pump - Breastfeeding Support Essential - Compatible with Spectra Breast Pumps : Baby
![Amazon.com: Nenesupply Silicone Backflow Protector Membranes Compatible with Spectra Backflow Protector Not Original Spectra Pump Parts Work with Spectra S2 S1 Breast Pumps (4pc Membrane) : Everything Else Amazon.com: Nenesupply Silicone Backflow Protector Membranes Compatible with Spectra Backflow Protector Not Original Spectra Pump Parts Work with Spectra S2 S1 Breast Pumps (4pc Membrane) : Everything Else](https://m.media-amazon.com/images/I/61L-hW9JndL.jpg)