21mm Flange Insert Compatible with Specified Breast Pump Brands

This product offers a variety of models, allowing mothers to adjust the size of the "breast milk channel" on the cover of the breast pump to suit their individual nipple sizes. This feature helps to improve breastfeeding efficiency, increase pumping capacity, and provide a more comfortable experience for mothers during the process. The Durceler 2 Piece 21mm flange inserts are compatible with a wide range of breast pump models, including Momcozy S9 S10 S12 Pro, bluefair, BIOBOO, S18 S21 S23 Wearable Breast Pump, Medela, Spectra S1 S2, TSRETE, FEISIKE, Rainyb, Bellababy MiniO, NCVI, kmaier, MomMed, NaNaLazy, NIRGU, Onlyeah, MomWills, Motif Luna, and Amada MYA. The inserts can reduce the 24mm shield nipple tunnel down to 21mm, and they are also compatible with Lansinoh and Freemie 25mm cups, reducing them to 21mm.

The product's seamless compatibility ensures optimal milk expression. It is suitable for nipple diameters ranging from 18-20mm (after a pumping session) or a nipple base circumference of 50.24 - 56.52mm before a pumping session. This makes it a great solution for mothers with small nipples who are using large breast shields, as proper nipple tunnel fit is essential for comfort and efficient milk output. The product can be used with Spectra and Medela (Freestyle, Harmony, Sonata, and Swing-Maxi pumps) as well as other brands.

The replacement guidance suggests replacing the inserts every 4-12 weeks, depending on the duration and frequency of each pumping session. The inserts are durable, clear, and comfortable, and they are made of BPA-free silicone material.

The product maintains compatibility with most hands-free bras. Mothers can use most hands-free bra cups with their original 24/25mm detachable shields, as long as the inserts are used inside. During operation, users need to squeeze the inserts slightly to ensure a perfect fit with the shield for optimal performance.

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