Having the correct flange size is so important to optimize milk supply and prevent irriation. Find compatible inserts that work for your pump, these were great for my spectra pump!
Flange Inserts 15mm for Medela/Spectra 24mm Shields, 4PCS
great tool for finding the correct flange size!
Nursi Luna Silicone Nipple Flange Ruler
My manual hand pump was great when I needed to empty quickly