IVARONAL 4PC Flange Inserts 21mm – Fits 24mm Flanges (Momcozy, Eufy, Elvie & More)

Customized comfort for your pumping routine

This IVARONAL 4PC Flange Insert set centers around a 21mm core designed to complement standard 24mm flange systems. It is built to work with popular breast pump brands that use 24mm flanges and shields, including Momcozy M5/M6/M9/S12 Pro, Eufy, Elvie, Medela, Spectra, Lansinoh, NCVI and TSRETE variants. The goal is to offer a snug, comfortable fit that may help make sessions feel steadier as your breastfeeding needs evolve.

Across the broader IVARONAL line, there are 10 sizes available to accommodate changing needs. This four-piece set provides practical options to dial in the right feel without overhauling your existing setup. Each insert is designed to replace original parts when needed, maintaining compatibility with your current pump system.

Comfort, fit and compatibility

What you may notice: a secure seal, soft silicone contact, and a stable alignment with your 24mm flange. These inserts aim to help preserve the intended inner diameter and flow characteristics to support a steady pumping rhythm.

• Compatible with a wide range of 24mm flange pumps from popular brands
• Soft silicone surface provides a snug, comfortable feel against the skin
• Easy to replace original parts within supported systems

Size range and material

The four-piece set is centered around a 21mm insert and is designed to fit into standard 24mm flange ecosystems. In the IVARONAL lineup, 10 sizes span 13–22 mm, making it easier to find a comfortable balance as you progress through your breastfeeding journey.

• Food-grade silicone material, BPA-free, odorless and skin-friendly
• Durable yet soft texture to support comfortable pumping sessions

Care and maintenance

Cleaning is quick and straightforward. After each use, wash with warm soapy water and rinse well. For sanitization, boil or steam at up to 100°C (212°F) for 5–10 minutes. Avoid harsh brushes; use fingertips for gentle cleaning.

Note that individual results can vary. This description highlights practical benefits and usage possibilities rather than guarantees.