Durceler 19mm Silicone Flange Inserts Compatible with Medela/for Spectra S1 S2 / Elvie / S18 S21 / Momcozy S9 S12/ TSRETE 24mm Breast Pump Shields or Freemie 25mm; Reduce Tunnel Down to 19mm

Durceler 19mm inserts (2pcs a Pack) to compatible with Medela / Spectra / Elvie / Willow / Momcozy / TSRETE / Bellababy / NCVI 24 mm breast shields. It will reduce the 24mm shield tunnel down to 19mm. Also compatible with Freemie 25mm cups to reduce it down to 19mm. Also applicable to most other brands of the models for 24-25mm.
Seamless Compatibility For Optimal Milk Expression: Suitable for diameter 16-18mm(after a pumping session), or measure the circumference of base about 43.96 - 50.24mm before a pumping session.
Great solution for small-d mothers using large breast shields, Proper tunnel fit is essential for comfort and efficient milk output. It can be compatible with Spectra and Medela (Freestyle, Harmony, Sonata, and Swing-Maxi pumps) and other brands.
BPA free, made of silicone material. Durable, clear, and comfortable. This accessory helps breast shields for more effective pumping and maximized milk expression while helping to avoid trauma or irritation.
Maintain compatibility with most handsfree bra. You can use most handsfree bra cups with they original 24/25mm detachable shields having this insert inside. During operation, you need to squeeze slightly to make the Insert fully fit with the shield to achieve the perfect effect.