How to measure the diameter of your nipple?
1. The standard flange size is often 24mm but you may need a smaller/larger flange/shield based on your measurement.
2. Compare the diameter of your nipple to the size guide chart.
Spectra 24mm (15-21mm Flange Insert) and 27mm ( 24mm Flange Insert).
Spectra Handsfree Cups.
MomMed Electric Breast Pump.
These little guys were hard for me to find online! They were always sold out! They fit my mommed pumps and I was scared to not have any backups since you have to have them for it to work and they're so tiny and easy to lose. So if you see these are available I'd definitely buy some extras because they are unavailable sometimes so better be safe than sorry!!
Breast Pump Accessories Duckbill Valves