After market pump parts made by Maymom for Ameda Breastpump pumps including Purely Yours, Purely Yours Ultra; This listing gives you all you need except bottles to make your pump perform like new.<p> <b>How to choose the right size of flanges?</b><br> Please measure your nipple diameter AFTER a pumping session first. You will need a flange that is 1-2 mm larger than your nipple diameter. You can use the nipple ruler designed by Maymom as shown in the photos of this listing.<p> <b>About Maymom</b><br> Maymom is an international company with resellers in many countries in the world. It makes breastpump parts that are compatible with main stream breastpumps like Medela, Avent, Ameda, Spectra and Hygeia. <p> The value of Maymom's existence is to care for each mom. Other than the general parts used by the majority of mothers, it also makes parts that are needed by small groups of mothers but not made by the big manufacturers. When you have a special need in breastpumping, contact Maymom!