Nenesupply 2nd Gen 21mm Flange Inserts – 24mm to 21mm Reduction (Elvie, Willow, Spectra)

Overview

Meet the Nenesupply 2nd Generation 21mm flange inserts—a two-piece silicone set designed to adapt a 24mm flange down to 21mm with comfort and ease. Crafted in soft, food‑grade silicone, these inserts fit a wide range of popular breast pumps, offering a snug seal and a smooth angle that can enhance the pumping experience. While not a guarantee of outcomes, their design focuses on user comfort and practical fit across brands.

What’s included and who it fits

The two inserts are engineered to reduce 24mm flanges to 21mm and are compatible with Elvie, Elvie Stride, Momcozy, Medela, Spectra, Willow, Willow Go, and Motif Luna flanges. This makes the inserts a versatile option for households using multiple pump brands or those who want a consistent 21mm sizing across their accessories.

• Two-piece silicone set for reliable sizing and easy storage
• Fits 24mm flanges from many major brands including Elvie, Willow, Spectra, Momcozy, Medela, and Motif Luna
• Offers a smooth angle and a soft feel for more comfortable sessions
• Designed to reduce 24mm to 21mm without changing the overall pump compatibility

Design, comfort, and performance

Made by NENESUPPLY, the inserts feature a smooth angle and soft silicone that aim to provide a comfortable fit during pumping. The embedded sealing circles help create a seal and support consistent suction, while the compact 21mm size targets the fit where it matters most. The design emphasizes reliability and ease of use, so swapping between accessories can feel seamless rather than fiddly.

Practical use cases

Use these inserts when you want a consistent 21mm inner diameter across different flange brands, or when a household owns multiple pumps and wants a unified size. They can be convenient for travel or busy days when swapping between devices is necessary.

• Improved compatibility across Elvie, Willow, Spectra, Momcozy and more
• Compact design that travels easily with pumps and accessories
• Compact 21mm size may offer a familiar feel for some users

Care, safety, and quality

Easy to clean and built with safety in mind. The inserts are top-rack dishwasher safe, BPA and DEHP free, and compliant with EU and USA regulations for materials that contact food. They have been tested by independent labs for quality and safety. Regular inspection and proper cleaning can help maintain performance over time.

Why choose NENESUPPLY

NENESUPPLY focuses on practical, compatible accessories that complement a range of pumps. The 2nd Generation 21mm inserts provide a flexible way to tailor fit without changing your entire flange kit. Consider them as a practical enhancement to your setup, offering more sizing options without promising specific results.