Mompmuir 18mm Silicone Flange Inserts — Universal Compatibility, Reducing 24–25mm to 18mm

Enhance comfort and fit with Mompmuir 18mm Flange Inserts

Designed to work across a broad range of pump brands, the Mompmuir 18mm silicone inserts give you a customizable fit that can feel more comfortable during sessions. The two-level taper guides milk flow while preserving suction, so you can focus on pumping without distraction. These inserts reduce a 24–25 mm nipple tunnel to an 18 mm opening, offering a more tailored fit for narrower bases while maintaining the familiar pumping experience.

Each package contains two inserts, built from soft, food-grade silicone that’s BPA and DEHP free. The arrangement is designed to be straightforward: install, pump, and remove with ease. The design remains compatible with the original pump parts, helping you keep a consistent pumping experience while you explore a slightly smaller flange option. The insert is safe for boiling water, steaming, and top-rack dishwasher use, and it’s designed with a seamless profile to minimize crevices during cleaning.

• Broad compatibility across brands such as Elvie Stride, Lansinoh, Medela, Spectra, Momcozy S9/S12, and more
• Two inserts per pack for convenience and quick swaps
• SAME SUCTION AS ORIGINAL PUMP PARTS with a two-level taper for smoother milk flow

The sizing guidance helps you select the right fit before pumping. If you’re targeting a snug base, 14–15 mm nipple diameters (or a base circumference around 43.96–47.10 mm) can be a good starting point for the 18 mm insert. Additional sizes are available (15, 16, 17, 18, 19, 20, 21, 22 mm) to accommodate a range of needs. The soft silicone offers a comfortable touch that remains durable through regular use, while the seamless construction supports easy cleaning and maintenance.

• 2-piece pack and easy to install/remove design
• Boiling water safe, Steam safe, Top-rack dishwasher safe, food-safe
• BPA and DEHP free

Use cases include scenarios where a slightly smaller flange helps you achieve a more relaxed pumping rhythm, reduces discomfort over longer sessions, and accommodates a variety of nipple base measurements. While results vary, many parents find that a properly sized insert can contribute to a calmer pumping experience and a consistent fit with their chosen pump system.