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Features & Benefits:
Precision fit for smaller openings: If your current flange feels too roomy or you’re noticing less efficient milk flow, these inserts reduce the tunnel diameter from 24 mm down to 18 mm—offering a closer fit without needing an entirely new flange.
Compatible across brands: Works with Spectra and Medela 24 mm hard plastic flanges (and many wearable-style pump cups) so you don’t need to ditch your existing gear—just insert and adapt. Not compatible with Elvie.
Comfort + efficiency boost: A better fit means less nipple movement inside the tunnel, fewer distractions, and better milk drainage—important when pumping amounts matter.
BPA-free, food-grade silicone option: Made for safe contact with breastmilk and designed to withstand routine cleaning and sterilization.
Who It’s For:
Pumping parents using Spectra or Medela pumps (or other systems with 24 mm shields) who feel their current flange is too large.
Anyone looking to fine-tune fit and comfort (especially if nipples feel crowded or rub during pumping).
Parents who want to optimize milk removal without investing in full flange replacement—just drop in the insert and use your existing 24 mm shield.
Occasional or regular pumpers who value gear adaptability and want to keep their setup flexible.
Product Details:
Size: 18 mm tunnel diameter (insert for 24 mm shields)
Pack: 1 pair (two inserts—one for each side)
Material: Food-grade silicone / BPA-free (depending on brand)
Compatible with: 24 mm hard-plastic flanges/shields from Spectra, Medela, Willow, Motif, and others as listed. Note: Not compatible with some wearable pump cups or extra-large sizes. NOT compatible with Elvie.
Care Instructions: Clean each after use with warm soapy water; sterilize as per your pump brand’s protocol; inspect periodically for wear or tears.
Note: This is an insert—not a full flange. It modifies your existing shield.
Why Choose This Over Generic Flanges or Stock Size:
If you’re currently using a “standard” 24 mm flange and finding that your fit isn’t ideal—whether your nipple has too much space, the areola is being pulled in, or your flow seems slower—then simply switching to a different full flange can feel like a big gear change. These inserts let you refine the fit without swapping entire systems. They provide targeted comfort, improve fit, and help you get back to focusing on pumping efficiently rather than fiddling with gear.
Make your pump gear work with your body, not against it. The 18 mm Flange Inserts can be the little upgrade that makes a big difference in comfort and performance.
Not sure of your correct flange insert? Make an appointment with Bonnie Knows Breast!