How to Clean and Replace eufy Breast Pump Parts

Quick Answer

Clean your eufy breast pump diaphragms and duckbill valves after every use, and replace them every 1–3 months or when you notice reduced suction or visible wear.

Step-by-Step Cleaning and Replacement Guide

1. Disassemble the Pump: Remove the breast pump flange, collection container, diaphragm, and duckbill valve from your eufy S2 or S2 Pro. Rinse each part under cool running water to remove milk residue. Do not use hot water initially, as it can set milk proteins and make cleaning harder.
2. Wash with Mild Soap: Use a gentle, fragrance-free dish soap and warm water. Clean each part with a soft brush, paying extra attention to the duckbill valve slit and the diaphragm edges where milk can accumulate. Avoid abrasive sponges or brushes that can scratch the silicone and create hiding spots for bacteria.
3. Inspect for Wear: Hold the duckbill valve up to light and pinch the slit open. If it gapes or doesn't close tightly, replace it. Check the diaphragm for any tears, stretching, or permanent creases. If you see any damage, don't reuse it. A valve that stays slightly open will cause suction loss and potential backflow.
4. Air-Dry Completely: Place all parts on a clean drying rack or towel in a well-ventilated area. Allow them to dry fully before reassembling. Do not use a dish towel to dry, as lint can stick to the silicone. Moisture trapped inside the valve or under the diaphragm can promote mold growth.
5. Replace Worn Parts: If your inspection revealed damage, install a new eufy duckbill valve or diaphragm. Align the diaphragm carefully over the motor housing so it seats flat. Push the duckbill valve onto the back of the flange until it snaps into place. A misaligned diaphragm can cause air leaks and reduce suction. Double-check the seal before pumping.

Parts You'll Need

• eufy Duckbill Valves (4-Pack) for Breast Pump S2 / S2 Pro: Exclusively designed to be fully compatible with eufy Wearable Breast Pump S2 and S2 Pro. The precision slit stays tightly closed between pumps, safely directing every drop into the container. Ensures milk flows only one way, preventing backflow and maintaining strong suction throughout your session.

  

• eufy Diaphragm (2-Pack) for Breast Pump S2 / S2 Pro: A fresh diaphragm delivers consistent suction for efficient pumping and safely blocks milk from entering the motor, keeping your pump clean and damage-free. Replacing the diaphragm protects the pump motor from moisture and preserves long-term pump performance.