To bring vacuum in the breast pump.
This silicone diaphragm and stem creates vacuum in your manual breast pump.
Philips AVENT CP9823, Transparent, Silicone, SCF330, 1 pc(s)
Philips AVENT CP9823. Product color: Transparent, Material: Silicone, Compatibility: SCF330. Quantity per pack: 1 pc(s)