Hranio Flange Sizing Kit 15/17/19/21mm – 8pc Silicone Inserts for Spectra, Momcozy & More

The Hranio Flange Sizing Kit brings eight soft silicone inserts in four common diameters (15, 17, 19, and 21 mm) to your pumping setup. Each size is paired (two inserts per size) so you can test fit, mix-and-match, and discover a more comfortable pumping rhythm. The transparent silicone feels gentle against skin, and the BPA-free material is designed with everyday use in mind. This kit supports a customizable fit without assuming a one-size-fits-all approach, so your equipment can adapt to you.

What’s inside the kit

• Two inserts each of 15 mm, 17 mm, 19 mm, and 21 mm (8 pieces total)
• Clear, durable silicone that stays comfortable during sessions
• Compatible with a wide range of 24 mm shields and flanges for common pump brands

Designed for compatibility

This kit is built to work with most 24 mm shields and flanges and is compatible with several popular wearable and traditional pumps. It pairs well with S9 Pro, S12 Pro, S9, S12 wearable pumps, and Momcozy models, and it can be used alongside 24 mm shields for brands such as TSRETE, Medela, Spectra, Elvie, Willow, and more. The goal is a flexible, adaptable setup that lets you explore different sizes as your needs change across days or outfits.

Important sizing notes and usage tips

• Important: These inserts are designed for 24 mm shields/flanges only and should not be used with other shield sizes.
• Small amounts of coconut oil or nipple butter may help reduce friction and make insert changes smoother.

Care, safety, and maintenance

• Easy cleaning: after each use, wash with warm, soapy water and rinse thoroughly.
• Safety: made from BPA-free transparent silicone for everyday confidence.
• Replacement timing: choosing the right size matters for comfort and potential pumping efficiency. Consider checking fit regularly and replacing inserts every 1–2 months as needed.

Real-world scenarios

Whether you’re balancing pumping with a busy schedule, experimenting with different outfits, or swapping between care routines, this kit puts choice at your fingertips. The ability to swap between multiple diameters helps you fine-tune fit, accommodate temporary swelling, or simply find a rhythm that feels more natural during your session. Think of this as a practical toolkit for adapting to everyday pumping needs rather than a one-size-fits-all solution.