Mompmuir 21mm Silicone Flange Inserts – Compatible with Elvie Stride, Lansinoh, Medela & More

Overview

The Mompmuir 21mm silicone flange inserts are designed to adapt a 24–25mm nipple tunnel to a narrower 21mm opening, helping you find a more comfortable fit during pumping sessions. Each pack includes two inserts and is built to work with a wide range of pumps, so you can maintain compatibility with your existing equipment while exploring a smaller, gentler tunnel size.

Sized for a Comfortable Fit

Before you pump, measure the nipple base to help choose the right size. A 17–18mm diameter (approximately 53.38–56.52mm circumference) is a common reference point for this 21mm insert. This size option is part of a broader family that includes 15–22mm variants, giving you flexibility as your needs change.

• 2 inserts per pack in the 21mm size
• Widely compatible with major brands and pump families

Design and Performance

These are second-generation flange inserts with a two-level taper designed to promote milk flow without blocking, while preserving the suction of your original pump. The soft silicone is gentle against the skin and aims to improve comfort during use while staying aligned with the pump’s performance.

• Two-level taper supports a smooth milk flow
• Maintains the same suction as the original pump parts

Safety, Materials and Care

Crafted to be safe for daily use, the inserts are BPA- and DEHP-free. They’re easy to install and remove, and they tolerate routine cleaning processes so you can fit sanitation into your busy day. The design is seamless to help minimize crevices where residue could collect.

• SAME suction as original pump parts
• Boiling water safe, steam safe, top-rack dishwasher safe
• Food-safe, seamless design for simple cleaning

Whether you’re transitioning to a smaller tunnel size or seeking a gentler pumping experience, these inserts provide a practical option to explore fit and comfort with a broad set of compatible pumps.