afontoto Flange Sizing Kit 15/17/19/21mm for 24mm Pumps | Momcozy, Spectra, Medela & TSRETE Compatible

Your flexible pumping companion

The afontoto Flange Sizing Kit gives you four silicone inserts in 15, 17, 19, and 21 mm, designed to fit most 24 mm flange/shields. This kit supports finding a comfortable, efficient fit as your breastfeeding journey evolves, potentially reducing the need for frequent replacements or purchases as your needs change.

Comfort-first design for steady sessions

Crafted from food-grade liquid silicone, the soft texture is gentle on skin while supporting a smooth milk transfer during pumping. The material is resilient and designed for repeated use across sessions, with care instructions that keep it clean and ready for the next pumping routine.

• Four sizes targeting different stages of breastfeeding
• Soft silicone that enhances comfort and can help support pumping consistency
• Reusable design, compatible with standard cleaning methods

Upgrade for smoother milk transfer

An upgraded 12 mm tunnel is incorporated to help milk move into the bottle more smoothly and to reduce friction at the nipple during pumping. This design can contribute to a more comfortable experience over longer sessions.

• Shorter tunnel promotes steady milk flow into the container
• Friction reduction supports a gentler pumping feel

Sizing clarity and ongoing fit

Use the included silicone nipple measurement card to monitor changes as you progress through stages of breastfeeding. If sizing remains stable, rotating the corresponding sizes every 2–3 months can help maintain comfort and pumping efficiency.

• Measurement card helps you track changes over time
• Guidance on when to switch sizes for continued comfort

What’s in the box

The kit covers your needs with practical inclusions for easy setup and maintenance:

• 8 silicone flange inserts across four sizes
• 1 silicone measurement card
• 1 scale measure
• 1 portable cleaning brush

Compatibility and service

Designed for 24 mm flanges, this kit works with popular pump systems including Momcozy M5/M6/S12 Pro/V1 Pro, Spectra, eufy, Medela, TSRETE, and similar brands. If you have questions or suggestions, our team offers responsive support to help you find the best fit for your routine.