IVARONAL Flange Inserts 15/17/19/21mm — 8pc Set for 24mm Shields, Compatible with Momcozy Air 1/W1/M5/M9/M6/S12 Pro/V1 Pro/V2 Pro, Spectra, Medela, Elvie & More

Smart comfort, flexible fit for daily pumping

The IVARONAL 8-piece flange insert set is designed to adapt to the changing needs of breastfeeding families. With two inserts of each size—15, 17, 19, and 21 millimeters—this kit expands your options for 24mm shield pumps, including Momcozy Air 1, W1, M5, M9, M6, S12 Pro, V1 Pro, V2 Pro, and many other brands that use 24mm shields. Built to work with most pumps that use 24mm shields, the inserts help you tailor the seal and feel of your pumping sessions without having to replace the entire shield.

We chose a skin-friendly, BPA-free silicone to keep the experience gentle on the skin. The soft-touch surface helps the insert sit smoothly against the shield, aiming to reduce friction and irritation during sessions. While individual results can vary, this design invites a comfortable, consistent contact that many users notice over time.

Seamless fit and potential efficiency

When the insert matches your equipment, suction consistency tends to feel steadier. The M5 flange insert variant is crafted to align with original pump parts, helping you achieve a snug seal and a familiar pumping rhythm. The result is a user-friendly upgrade that supports comfortable sessions and a steady workflow for daily pumping.

• Eight pieces total, two per size, for quick swaps if measurements change
• Broad compatibility with Momcozy, Spectra, Medela, Elvie, Lansinoh, and more
• Designed to work with 24mm shields for a familiar setup

Size matters: choose the right fit

The four sizes cover a range of fits to help minimize rubbing and squeeze. If a size feels tight or rubs in the channel, switching to a different option can make a noticeable difference. The 15mm and 17mm options fit tighter under the shield, while 19mm and 21mm provide more room for comfort and alignment.

• 4 sizes to match changing needs across your pumping journey
• Proper sizing supports better alignment with the shield and potential comfort gains
• Compatibility extends across many brands with 24mm shields

Care, durability, and maintenance

Maintenance is simple: rinse with warm soapy water after each use and rinse well. The inserts tolerate brief heat exposure up to 100°C (212°F) for 5–10 minutes. For ongoing performance, consider replacing every two months.

• Easy to clean and quick to dry
• Durable silicone designed for daily use
• Recommended replacement every two months for optimal function

Helpful at-a-glance tips

• Measure your shield diameter and nipple-feel to guide size choice
• Start with the middle option (17–19mm) if unsure, then adjust
• Store clean and dry between uses to maintain material integrity