Willow Go® Flange Set (2-pack)
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Find your flange fit. Pump with confidence.
When it comes to wearables, sizing is different — you'll need a fit that's more snug. Most moms find that adding 1-3mm to their nipple size (or 0-2mm if you're pumping with Willow 360) results in optimal output and comfort.
Still need your nipple measurements? Try our sizing guide
Measured Nipple Size |
Willow Recommended Size Flange / Insert |
9-11mm | 13mm insert in 24mm flange |
12-13mm | 15mm insert in 24mm flange |
14-15mm | 17mm insert in 24mm flange |
16-17mm | 19mm insert in 24mm flange |
18-20mm | 21mm flange |
21-23mm | 24mm flange |
24-26mm | 27mm flange |
Sizing inserts can only be used with a 24mm flange or 24mm container insert.
Questions? Our experts can help.
1-888-WILLOW-3
How To Find Your Nipple Size
Step 1: Get a measuring tape
Measure the diameter of your nipple at its base while erect to determine its size accurately.
Step 2: consider sizing up
Most moms find that adding 1-3mm to their nipple size results in optimal output and comfort.
Step 3: take a look at our chart
Match your measurements to our sizing chart to find your recommended size flange / insert.
Insurance & HSA/FSA
FSA/HSA reimbursements eligible
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- Available in 3 sizes to help you find your fit: choose from 27 mm, 24 mm, or 21 mm based on your nipple measurement
- Sizing inserts fit inside our 24 mm flanges for a more snug and comfortable fit
- Parts are dishwasher safe for easy cleanup
- Clear in color for easy nipple visibility and fast assembly.
- Not made with BPA for a safer pumping experience
2 Willow Go Flanges
You can shop all Willow Go accessories here.
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Replacing Your Parts
For optimal output, replace every 90 days (or when you notice discomfort or signs of wear).
- Allyse C.Verified BuyerI recommend this productRated 5 out of 5 stars12 hours agoWorks great!
Works great and fits just right!
Was this helpful? - Samantha W.Verified BuyerI recommend this productRated 5 out of 5 starsYesterdayWillow go flange set
Works great!
Was this helpful? - Ashley C.Verified BuyerI recommend this productRated 5 out of 5 stars2 days ago27 mm flange pack
I am happy I ordered this size flange, fits my nipples way better than the 24 and 21 that the willow pump comes with! I would love if we had the option to choose one or two flange sizes when we purchase the Willow instead of automatically being given the 21 and 24 mm. That way I could have saved $30 by not needing to buy an extra size and the 21 mm could have gone to somebody else.
Anyway, great product overall thank you
Was this helpful? - Mary O.Verified BuyerI recommend this productRated 5 out of 5 stars2 days agoGreat to have extra
I purchased an extra set of these with my Willow Go pump so I could quickly change swap parts for my next pump.
Was this helpful? - Brenda B.Verified BuyerI recommend this productRated 5 out of 5 stars1 week agoGreat
These work great!
Was this helpful?