Silicone Duckbill Valve & Membrane Kit for S18/S21 Breast Pump

Keep Your Breast Pump Working Like New

Worn-out valves and membranes can reduce suction and make pumping less efficient — and for breastfeeding moms, every drop counts. These soft silicone replacement parts are designed specifically for S18 and S21 electric breast pumps, giving you a complete repair kit so you can get back to comfortable, effective milk expression quickly.

Made from body-safe silicone + PP (polypropylene), these parts are free from high-concern chemicals, easy to clean, and built to maintain a strong, consistent seal for optimal milk flow. Whether you're pumping at home, at the office, or on the go, these replacement parts help you maintain your milk supply without missing a beat.

Made in Mainland China.

FDA Disclaimer: This product is a breast pump accessory and is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider with any questions regarding breastfeeding or lactation.

What's Included in the Kit

• ✅ 1× Silicone Diaphragm — maintains suction integrity
• ✅ 1× Duckbill Valve — ensures smooth, one-way milk flow
• ✅ 1× Milk Collector — captures every precious drop
• ✅ 1× Flange — comfortable, secure fit during pumping sessions

Key Features & Benefits

• 🍼 Compatible with S18 & S21 Electric Breast Pumps — precision-fit replacement parts
• 🌿 Soft, Body-Safe Silicone — gentle on skin, flexible and comfortable
• 🧼 Easy to Clean — hygienic design for worry-free pumping
• 💨 Restores Suction Power — worn valves are a leading cause of reduced pump efficiency
• 🏠 Pump Anywhere — home, office, or travel-ready
• 📦 Complete Repair Kit — everything you need in one package

Specifications

Note: Please allow 1–2 cm variance due to manual measurement. Slight color differences may occur due to screen resolution.

Expert Breastfeeding Resources

For tips on breastfeeding and pumping, visit the CDC Breastfeeding Resource Center — a trusted guide for nursing mothers.

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Frequently Asked Questions

Q: Are these silicone duckbill valves compatible with all breast pump models?

A: These replacement parts are specifically designed for S18 and S21 electric breast pumps. Please verify your pump model before purchasing to ensure a proper fit and seal.

Q: How often should I replace breast pump valves and membranes?

A: Most lactation consultants recommend replacing duckbill valves and silicone membranes every 4–8 weeks with regular use, or sooner if you notice reduced suction, cracks, or milk residue that won't clean off. Fresh parts help maintain optimal milk expression efficiency.

Q: Are these parts safe and free from harmful chemicals?

A: Yes. These replacement parts are made from body-safe silicone and PP (polypropylene) with no high-concern chemicals, making them suitable for use in breast milk expression for infants.

Q: How do I clean these silicone replacement parts?

A: These parts can be rinsed with warm soapy water after each use. They are designed for easy cleaning to maintain a hygienic pumping experience. Always allow parts to air dry completely before reassembling your pump.