Silicone Flange Inserts 13/15/17/19/21mm for 24mm breast pump flanges (10pcs) – compatible with Momcozy, Lansinoh, Elvie, Willow go, Spectra and more

If your 24mm pump shield doesn’t feel quite right, these silicone flange inserts are a practical way to fine-tune the fit. On paper they’re designed to reduce the nipple tunnel of a 24mm flange from its wider opening down to smaller sizes (13mm, 15mm, 17mm, 19mm and 21mm), which can matter when your body changes during different stages of pumping.

It’s also one of those accessories that can be more important than it sounds. The wrong insert size can lead to friction or compression in the flange groove, and that’s the last thing you want while trying to empty comfortably. That said, they’re not a universal “fix everything” item—there are clear limits (for example, they’re not for 27mm shield covers), so it’s worth checking what you’re working with before ordering.

What these inserts are for

These are food-grade silicone flange inserts sold as a 10-pack. The idea is straightforward: you place the right insert size into a compatible 24mm flange/shield area, so the nipple tunnel matches your current needs more closely. Because nipple size and swelling can vary, the smaller insert options give you flexibility rather than forcing you to stick with one setup.

A realistic example: if you start the week pumping and everything feels comfortable, then later you notice more swelling or a tighter feeling, switching to a slightly larger or smaller insert can help you keep the fit more consistent without replacing the whole pump kit.

Key features that affect day-to-day comfort

What you’ll notice is less about “features” and more about comfort and fit. The inserts are intended to:

• help you achieve the correct tunnel size when using a 24mm flange/shield
• adapt as physiological stages change (so the same pump can still feel workable)
• reduce friction risk if you’ve previously found the opening too wide

One limitation to keep in mind: compatibility is described broadly with many wearable breast pumps and shield systems, but that doesn’t automatically mean every single 24–25mm setup will be a perfect match in every case. If you’ve ever had to make do with a slightly off fit, you know how much that can change the experience.

Compatibility and what to double-check

The base description states these inserts are compatible with most wearable breast pumps, including popular brands such as Momcozy, Lansinoh, Elvie, Willow go, Spectra and Medela Freestyle Flex. It also says they work with most other brands’ 24–25mm models and are compatible with the MISSAA hands-free breast pump.

That said, there’s a specific exclusion mentioned: they are not suitable for 27mm shield covers. Before buying, double-check that you’re actually working with a 24mm flange/shield (or described as 24–25mm in your setup) and that you’re not using a 27mm cover.

Cleaning, sterilisation and day-to-day maintenance

Keeping silicone accessories hygienic is part of the routine. The instructions provided are practical: wash with warm soapy water after each use.

For sterilisation, the guidance is that you can use steam, boiling water, or a microwave steam bag. However, there’s an important temperature ceiling listed—do not exceed 200 degrees Celsius for sterilisation.

Also worth noting: the lifespan depends on how frequently you use them and how you clean them. The guidance is to replace pump accessories every 1 to 2 months to help maintain optimal performance. That replacement interval may be more frequent than some people like, but it’s consistent with how wear-and-tear can build up in silicone parts.

Who it suits (and who may want to skip it)

It makes sense if you want a simple way to adjust fit without swapping to a completely different system, especially if your nipples swell and comfort changes during pumping. If you’ve noticed the nipple tunnel feels too wide, or you’ve been dealing with mild friction/compression, these inserts are designed specifically to address that size mismatch.

It may not suit you if:

• you’re using 27mm shield covers (they’re not for that size)
• you’re unsure whether your flange/shield is truly the 24mm (or 24–25mm class) setup
• you’re hoping for a one-size-fits-all solution across unrelated shield diameters (these inserts are meant for reducing a 24mm tunnel to smaller sizes)

Tech specs

• Type: Silicone flange inserts
• Sizes included: 13mm, 15mm, 17mm, 19mm, 21mm
• Quantity: 10pcs
• Material: Food-grade silicone, BPA-free

Is it worth it?

Buying verdict: these 13/15/17/19/21mm silicone flange inserts are worth considering if your main goal is comfort through better sizing when using a compatible 24mm flange/shield system, and you want the flexibility to adjust as things change. The cleaning guidance is straightforward, and the “replace every 1 to 2 months” note suggests the manufacturer expects regular use.

Skip this if your kit is based on a 27mm shield cover, or if you can’t confidently confirm you’re using a 24mm flange/shield (or the stated compatible 24–25mm models). In those cases, you might end up with the wrong tunnel size again—precisely what you’re trying to avoid.

Quick FAQ

Do these inserts fit 27mm shield covers? No—please note they’re not suitable for 27mm shield covers.

What sizes do you get in the pack? The inserts come as 13mm, 15mm, 17mm, 19mm and 21mm sizes (10 pieces total).

How should I clean and sterilise them? Wash with warm soapy water after use. For sterilisation, steam, boiling water, or a microwave steam bag are mentioned, with a maximum temperature of 200 degrees Celsius.

How often should I replace the inserts? The guidance provided is to replace pump accessories every 1 to 2 months, or sooner if you notice damage.