Act as a physical barrier between milk and the pump motor to prevent milk from flowing to the pump.
Old version's cover screw together to secure the membrane inside.
Part connecting to spectra breast shield is fragile. When slotting into spectra breast shield, too tight will result in difficulties pulling out. Please secure into spectra breast shield, not all the way in.
Price stated is ONLY for 1 piece, please add two time if you need a pair