Extra parts for mom-on-the-go! Breastshield, valve and membrane for Medela breast pumps and any standard universal container except Harmony. The Medela Breastshield is soft, flexible and comfortably massages the breast and areola. It imitates a baby"s sucking action on the breast and helps to encourage milk flow. Legal Statements: This and all items from Medela are excluded from all promotions and discounts except where otherwise noted on product detail pages.