The Eufy Baby Flange Insert 2s is a 2-pack of 21 mm silicone flange inserts designed to fine-tune the fit of your eufy wearable breast pump. If the standard flange feels a little large, an insert like this reduces the tunnel diameter so the seal sits more comfortably against the breast, which can make each pumping session feel smoother. It's a replacement and sizing part rather than an upgrade — the right insert size is about comfort and fit, not extra suction.
Nipple size can change across different stages of breastfeeding, so it's common to need more than one insert size over time. This pair gives you a 21 mm option to keep on hand, and because inserts are a wear part, having spares means you're not caught short when one needs replacing.
Compatibility
These inserts are made to fit the eufy Breast Pump E10, E20, S1 and S1 Pro. As with any pump part, matching the exact model matters, so check that your pump is one of these before ordering.
How to Use
- Before first use, sterilise all washable components by boiling for 5 minutes with continuous stirring, or steaming for 5 minutes.
- Fit the insert into the flange, and make sure the duckbill valve, flange tunnel, diaphragm and pump hub are all securely sealed.
- Refer to eufy's sizing guide to confirm 21 mm is the right size for your comfort, adjusting as your needs change across feeding stages.
Replacing your inserts
Flange inserts are a soft, milk-contact part that wears with use and repeated sterilisation. eufy recommends replacing inserts roughly every 1 to 2 months, and typically expects a lifespan of around 3 months — replace sooner if you notice suction or performance dropping off. Made from food-grade soft silicone, they're covered by a 90-day limited manufacturer's warranty.
Care & Maintenance
Easy to install and use
Customized comfort for optimal fit
Made from food-grade soft silicone
eufy Breast Pump E20
eufy Breast Pump S1
eufy Breast Pump S1 Pro
- 2x Flange Insert (21mm)