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Features & Benefits:
Sized for performance: With a 17 mm internal diameter, these flanges are for those aiming to down-size from larger flanges for better drainage and comfort.
Enhanced comfort + fit: A better-fitted flange helps reduce nipple movement inside the tunnel, minimizes friction, and supports more consistent milk removal. Flange fit plays a key role in pumping efficiency and comfort.
Compatible with Spectra systems: Built to align with Spectra’s flange interface—so you don’t need to reinvent your setup, just swap the size.
Pack of two for convenience: Two flanges in the set mean you can keep one at your pumping station and one in your bag—or rotate them for cleanliness and backup.
BPA-/DEHP-free material: Designed with safe materials for breast-milk contact and daily use.
Who It’s For:
Ideal for pumping parents who:
Feel their current flange is too large (pocketing air, aren’t getting full drainage, or have more areola movement).
Are experiencing slower output and suspect it's due to a loose fit.
Wear a size that comfortably fits within the 17-mm specification and who want an optimized, comfortable session.
Use Spectra S-series pumps and want a minimal-gear change-out for better comfort and performance.
Product Details:
Size: 17 mm internal rim diameter.
Pack: Two flanges included.
Material: Safe for breastmilk contact; designed for cleaning, sterilization, and regular use.
Compatible With: Spectra S1, S2, 9+ (and possibly other pumps supporting the same flange connection) – double check your pump’s flange threading/interface.
Care Instructions: Clean thoroughly after each use, inspect for cracks or wear, and replace if any damage appears. Refer to your pump’s user manual or flange sizing guide.
Why Choose This Over “Standard” Flanges:
Standard flange sizes often aim for “one-fits-many”, but your fit really matters. Poor fit can lead to reduced milk flow, nipple discomfort, or inefficient drainage. These 17 mm flanges give you a targeted size choice—less guesswork, more comfort, and potentially better output. If you’ve been accepting a “just okay” fit, this upgrade can change your pumping game.
Make your pumping gear work with your body, not against it—choose the 17 mm Spectra Flanges 2-Pack and step into better fit, comfort, and performance.
Not sure about your correct flange size? Make an appointment with Bonnie Knows Breast!
FAQ
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Breastshields (also called flanges) are the tunnel-shaped parts of your pump that fit over your nipples during pumping. Different sizes matter because the diameter of your nipple — not your breast size — determines the best flange fit. The correct size helps reduce discomfort and can improve milk flow and comfort during pumping.
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These 17 mm shields are best for pumping parents whose nipples fit better in a smaller diameter flange — often those who are experiencing some discomfort, air gaps, poor suction, or feel their current shield is too large. A better fit can reduce friction and improve comfort.
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Signs your shield might be too large include:
Nipple rubs, feels squished, or moves unevenly inside the tunnel
Excess areola pulled into the shield
Discomfort or pain during pumping
Little milk is being expressed
If you notice these, trying a smaller size like 17 mm may help.
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Yes — they are designed to be compatible with Spectra S-series pumps (including S1, S2, 9+ models) and other systems that use the same wide-neck connection. Always double-check your pump’s interface to confirm compatibility.
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A precise fit doesn’t guarantee more milk, but it can improve drainage efficiency and comfort — factors that often contribute to better overall pumping results for many parents. Correct flange sizing helps ensure your pump works with your body rather than against it.
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Spectra recommends replacing breast pump accessories — including breastshields — every ~6 months if you pump regularly, or sooner if you see damage, cracks, warping, or buildup that cleaning can’t remove.
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Yes — many parents find that one breast may require a slightly different size flange than the other. It’s normal for nipples to vary in size and changing sizes can help maximize comfort and output.
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To find your best flange size, measure just the nipple diameter at the base (not the areola). Spectra suggests adding a small margin (e.g., 2–3 mm) to the measurement to determine the nearest flange size that lets your nipple move freely without too much space.
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Yes — like other Spectra compatible shields, they’re made from safe materials that can be washed and sterilized after each use. Clean them thoroughly and check for wear before pumping.
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If sizing alone doesn’t resolve discomfort, consider checking your suction settings, flange positioning, or consult a lactation support specialist — many discomfort issues stem from technique or fit nuances beyond size alone.
Schedule an appointment with Bonnie Knows Breast to help you find your exact correct size!