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Maymom Wide Mouth One-Piece Breastshield with Valve and Membrane For Spectra, 1pc (10 Sizes)

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Product Description

  • One-piece design; easy to clean, less piece to keep, and less chance for suction power loss.
  • All components are safe for steam sterilization, microwave sterilized or sterilized in boiling water.
  • Compatible with all Medela pumps except Sonata, FreeStyle, Swing Maxi and Harmony.
  • US FDA registered medical device; Comply with US FDA standards for containers that contact food and class II medical device.
  • Standard sized 25 mm inner diameter is most comfortable for the majority of breast feeding moms. However, other sizes are available too.
  • Other sizes to choose from -19, 21, 24, 26, 27, 29, 30, 34, 36 mm one-piece flanges 

This product is made by Maymom to fit spectra pumps. It is known that using the correct size of flange (breastshield) in breastpumping is the most important factor in achieving comfort and efficiency. Every mother was created differently. One or two sizes can’t fit all. This is why Maymom develops more than 12 sizes of flanges spanning from 13 mm up to 36 mm to fit the average mothers and those mothers who need special sizes (e.g. 13, 15, 17, 36 mm). Measure your nipple diameter first, and then use the size selector of this listing to choose the size that is 1-2 mm larger than your nipple diameter AFTER a pumping session.

  • Compatible with all Spectra pumps (S1/S2/M/9+) and older Spectra breastpumps (Dew 350, 360Connects directly to Spectra backflow protector; no need for yellow flange adaptor!
  • Pumps into wide-neck milk bottles ONLY (e.g. Spectra Bottles, Philip Avent, etc)
  • Flange and connector in one
  • Comes with flange, valve and a membrane
  • Made from BPA free PP material.
  • Steam safe, autoclaveable.
  • One piece for easy cleaning.
  • US FDA compliance

 There are improvements of this flange over the original spectra design

  1. In addition to spectra’s duckbills, you can use Maymom’s valve/membrane system with this Maymom flange. You can also try other brands of duckbills/valve/membrane on this flange. The chances are that they will fit.
  2. In additional to fitting Spectra’s backflow protector, you can use Maymom’s long stem, as well as short stem backflow protectors. You can also use Maymom’s tubing connector (sold separately) to connect this flange to many other popular breastpumps on the market.

Content of the kit:

  • Flange of wide mouth bottle connection x1
  • Valve x1
  • Membrane x1

About Maymom

  • Maymom is specialized in developing breast pump parts that can work with many name brand pumps on the market. The value of Maymom is to care for each mom!


  • Maymom is an independent company. Spectra is a trademark of Uzinmedical, Korea. Maymom is not affiliated with Uzinmedical.

How to choose the right size of breastshields for you?

The inner diameter of the breastshield (B) should be 1-2 mm larger than the diameter of your nipple (N). AFTER a pumping session or 3-5 mm BEFORE a pumping session.  You should be able to see free movement of your nipple during pumping and there should be little or no suction of the areola into the tunnel of the breastshield.


When it comes to pumping comfort, every millimeter counts.  That is why we design a series of breastshields of small increment sizes.  Maymom MyFitTM one-piece breastshields are available in 15 (XXS-), 17 (XXS), 19 (S-), 21 (S), 24 (M), 25 (M+), 26 (L-), 27 (L), 29 (XL-), 30 (XL), 34 (XXL-), and 36mm internal diameters plus 22 mm and 28 mm inserts to fit the majority of breast pumping mothers


How to measure the diameter your nipple?

Download the nipple caliper file, print it out, cut through the red line, fold along the green dots then you have made yourself a nipple diameter measuring tool!  See below for the finished ruler.


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Product Reviews

  1. fits well 5 Star Review

    Posted by on 11th Jan 2021

    though it could not be delivered at the scheduled time, I was refunded for the extra I paid for express delivery, and kulily customer svs responded very quickly. product is authentic, good service, will buy again.

  2. good product as described 5 Star Review

    Posted by on 7th Sep 2018

    One piece no frills fits spectra s1+

  3. good service 4 Star Review

    Posted by on 28th Aug 2018

    Kulily offers the most complete range of sizes for the breast shield. It works for my spectra S1 plus breast pump. The product is made in Taiwan.
    Overall the service is prompt and good. Product is good. However the membranes is different from the original one. In my opinion the original spectra membrane works better