The Spectra Membrane for Backflow Protector is a replacement silicone membrane for the backflow protector used in your Spectra breast pump. It sits between the upper and lower cases of the protector, creating the seal that lets the pump build suction while keeping your milk separated from the motor. If the membrane wears down or is damaged, this spare lets you refresh that seal without buying a whole new backflow protector.
Spectra pumps use a closed system, which means your breast milk never comes into contact with the pump itself. The backflow protector is what makes that possible, and the membrane is the small part inside it doing the work of regulating air pressure. Over time silicone loses some elasticity, and a worn membrane can mean weaker suction and a less comfortable session — so having a fresh one on hand is a simple way to keep your pump working the way it should.
How it Works
- Closed-system barrier: The backflow protector keeps expressed milk separated from the pump motor, so milk stays in the milk path rather than reaching the tubing and pump.
- Air-pressure seal: The membrane creates a secure seal inside the protector, which is what allows the pump to build and hold its vacuum for smooth, efficient expression.
- Wear over time: As the silicone loses elasticity with use, the seal weakens — which is why the membrane is a wear part that's designed to be replaced rather than repaired.
How to Use
- Separate the two halves of your Spectra backflow protector.
- Insert the new membrane.
- Reassemble the protector.
Care
Made from food-grade silicone that's BPA- and toxin-free, the membrane is built to withstand frequent sterilising and is easy to clean, assemble and replace. Inspect it regularly for signs of wear, stretching or thinning, and replace it every two to eight weeks depending on how often you pump.
Compatibility
This membrane is compatible with all Spectra pumps that use a backflow protector. If you're unsure which spare your setup needs, check that your pump uses a two-part backflow protector with a membrane inside before ordering.
Best For
The Spectra Membrane for Backflow Protector is a great option for parents who:
- Pump regularly and want to keep a fresh membrane on hand as a wear part
- Have noticed weaker suction and want to rule out a worn membrane before replacing anything larger
- Prefer replacing just the membrane rather than the whole backflow protector
Care & Maintenance
Maintains strong, consistent suction for efficient pumping
Prevents backflow, keeping milk separate from the pump motor
Easy to clean, assemble, and replace when worn
- 1x Spectra Backflow Protector Membrane