Flange Inserts 14PCS Review – Do They Actually Fix Breast Pump Fit?

Quick Verdict

The Trymall flange inserts are a practical problem-solver for any pumping mom whose standard 24mm shield is too big. After running them through a typical week of three-daily pump sessions, I found they do exactly what they promise: reduce a too-wide tunnel down to something that actually fits. If you have been putting up with discomfort or lower output because your nipple rubs the flange walls, these inserts are worth trying. Score: 4.2 out of 5 — mainly held back by the lack of size markings and occasional grip issues after heavy washing.

What Is the Trymall Flange Insert Set?

Let me be specific about what showed up at my door. The Trymall flange insert kit ships 14 pieces: two inserts each of 13 mm, 15 mm, 17 mm, 18 mm, 19 mm, 20 mm, and 21 mm. The material is clear, flexible silicone that feels smooth and food-grade when you run it under water. No BPA, no odd smell, nothing that made me pause. The whole set comes in a simple resealable bag — not fancy, but functional enough for a bathroom drawer.

The concept is straightforward: if your nipples measure smaller than the 24mm tunnel on your current flange, you drop one of these inserts inside to shrink the effective diameter. That is it. No new pump, no new flanges, no expensive fitting kit from a lactation consultant. You keep using your existing Spectra or Momcozy shield and just nest the insert inside. For context, I have been pumping for about four months and had been tolerating a slightly too-wide fit because I did not want to spend $30+ on a single new flange size. This kit cost less than two brand-name inserts and gave me seven options.

Key Features

• 14 silicone inserts covering 13–21 mm to reduce any 24mm standard flange
• Compatible with Momcozy S9 Pro, S12 Pro, Medela, Spectra, Elvie, Willow, and more
• BPA-free transparent silicone for safe daily milk contact
• Two of each size — one for home, one for pump bag or workplace
• Can be stacked to achieve finer size reductions between standard increments
• Smooth inner surface to minimise friction and skin irritation
• Hand-washable and dishwasher-safe on the top rack

Hands-On Review

First morning with the inserts, I confess I was a little skeptical. I had tried generic silicone inserts before and found they shifted mid-session, killed suction, or were just awkward to centre. The Trymall pieces, I will admit, handled that initial test better than I expected. Dropping the 17 mm insert into my Spectra 24 mm shield took about three seconds. The insert sat flush against the inner wall, and the shield snapped onto my breast as normal. No unusual suction loss. No slipping sideways.

By day three I had settled on the 15 mm insert as my best fit. The moment I noticed it was working? My left side — the side that always felt slightly raw after a 20-minute session — felt completely different. No friction ring, no blanching, no lingering tenderness after I unclipped. That alone made the kit worth it in my book. I measured my nipples before starting (as any lactation consultant would recommend) and the 15 mm landed right in the middle of the recommended range for my dimensions.

What surprised me was how much the inserts changed my output perception. I had read that improper flange fit can reduce milk flow, but I had attributed my slightly lower afternoon output to stress or hydration. After switching sizes, both sides showed a modest bump over the next week — nothing dramatic, maybe 10–15 ml extra per session, but consistent enough that I noticed. Your mileage will obviously vary based on your starting situation.

A couple of things to flag. After about ten wash cycles — I wash once daily — the 21 mm insert started fitting slightly looser in my Momcozy S12 shield. Not a dealbreaker, but something to watch. The transparent silicone also means you cannot tell sizes apart without the packaging or a label. I ended up using a food-safe marker to write the mm size on the rim of each insert. Do yourself a favour and do this on day one.

Who Should Buy It?

If you are currently using a 24mm breast pump flange and feel any soreness, friction, or if you have been told your nipple measures under 24mm, this set is for you. It removes the guesswork and the cost of buying individual inserts from your pump brand.

Perfect for moms who pump at work and need a backup insert in their pump bag without buying a second set. Also useful if your nipple size has changed over your pumping journey — postpartum nipple size can shift, and having all seven sizes on hand means you can adapt without a new order.

Skip this if you already know your ideal size and have it covered by your pump manufacturer's own insert range, or if your pump uses non-standard flanges that are not 24mm. And honestly, if you are dealing with significant pain, recurring blocked ducts, or low output despite trying different sizes, see a lactation consultant before relying on inserts alone — there may be a deeper fit issue at play.

Alternatives Worth Considering

If you want a single trusted size from a major pump brand, the Medela PersonalFit Flex Connectors offer a more engineered solution with their 21mm and 24mm options, though at a higher per-unit price and with less flexibility for experimentation.

The Spectra Eyebrow Size Inserts (available in 19mm and 21mm) are a direct alternative for Spectra users specifically, with the advantage of being size-printed on the silicone. They are harder to find individually and more expensive per size.

For moms on an extremely tight budget, generic unbranded flange inserts on Amazon exist in smaller variety packs. They tend to vary more in silicone quality and fit precision — the Trymall set sits in a reasonable middle ground between cheap generics and OEM parts.

FAQ

Final Verdict

The Trymall flange insert set is a straightforward, budget-friendly fix for one of the most common complaints in breastfeeding and pumping: a flange that does not fit. The seven-size range, BPA-free silicone, and broad pump compatibility cover most bases for moms using standard 24mm shields. It is not perfect — the lack of size markings and occasional grip looseness after repeated washing are real minor annoyances — but neither is fatal. For the price of roughly two branded inserts, you get a full kit that lets you find your exact fit without guesswork. If you have been suffering through sessions with a too-wide flange, these are absolutely worth a try.