How to Use the Willow Sync Backup Parts Set: Installation and Care
By Willow: Wearable Breast Pump – Willow Pump | Published: 2026-08-31
Category: How-to Guides
Learn step-by-step installation and care for Willow Sync backup parts. Extend lifespan, ensure hygiene, and keep your pump running smoothly.
Keeping your Willow Sync wearable pump in top shape means having backup parts on hand and knowing how to swap them out. Whether you’re a first-time user or a seasoned pumper, understanding the installation and care of your Willow Sync backup parts set can save you time, money, and frustration.

In this guide, we’ll walk you through the essentials: what’s typically in a backup parts set, how to install each component correctly, and how to care for them to extend their lifespan. We’ll also share practical tips for cleaning and when to replace parts, so you can pump with confidence.
What’s in the Willow Sync Backup Parts Set?
A Willow Sync backup parts set typically includes the essential components that wear out or need regular replacement: diaphragms, duckbill valves, and sometimes containers or flanges. The exact contents can vary, so always check your kit’s label. For example, the Willow Go® Pump Diaphragm Set (2-pack) is a common replacement for the Willow Go, but for Willow Sync, you’ll want to find the specific Sync diaphragm set.

Having a backup set ensures you’re never caught without a clean part when you need to pump. It’s especially handy for working moms or frequent travelers. Consider pairing your backup parts with accessories like the Catch-All Milk Cups to minimize spills and make pumping on the go easier.
- Check your kit’s contents against your pump model to ensure compatibility.
- Keep backup parts in a labeled container to avoid mixing with used parts.
Step-by-Step Installation of Willow Sync Parts
Installing new Willow Sync parts is straightforward but requires attention to detail. Start by washing your hands thoroughly and ensuring all parts are dry. Remove the old diaphragm and duckbill valve from the pump. To install the new diaphragm, align it with the valve opening and press down gently until it snaps into place. Ensure it sits flat and there are no gaps.
For the duckbill valve, insert it into the flange or container opening, pushing until it fits snugly. The slit should face the direction of milk flow. If you’re replacing the container, twist it onto the pump body until it locks. Always refer to your user manual for model-specific instructions, as improper installation can cause leaks or reduced suction.
- Test the pump with a small amount of water before your first use to check for leaks.
- If parts feel loose, remove and reinstall; do not force them.
Caring for Your Willow Sync Parts: Cleaning and Maintenance
Proper care extends the life of your Willow Sync parts and ensures milk safety. After each use, disassemble the pump and rinse all parts in cool water to remove milk residue. Then wash with warm, soapy water using a mild detergent. Avoid abrasive sponges that can scratch the silicone. Rinse thoroughly and air-dry on a clean towel or drying rack.
For deep cleaning, you can sterilize parts in boiling water for 2-3 minutes or use a steam sterilizer. However, check the manufacturer’s guidelines, as some parts may not be dishwasher-safe. Regular cleaning prevents milk fat buildup, which can affect suction and hygiene. Replace parts every 3-6 months or sooner if you notice cracks, tears, or stretched silicone.
- Use a dedicated brush to clean the tiny crevices of the duckbill valve.
- Store dry parts in a clean, sealed container to keep them dust-free.
When to Replace Willow Sync Parts
Even with excellent care, parts wear out. Signs that it’s time to replace include decreased suction, milk leaking from the valve, or visible damage like tears or holes. If you’re pumping less milk than usual, check the diaphragm and valve first. A stretched duckbill valve can cause milk to flow backward into the pump, reducing output.
Keeping a backup set ensures you can replace parts immediately. Consider investing in a protection plan like the Clyde Protection Plan for added peace of mind, covering accidental damage and wear. Also, pair your backup parts with the Willow 360® Spill-proof Milk Bags (48-pack) for convenient, safe storage of expressed milk.
- Mark your calendar to inspect parts monthly.
- Replace parts at the first sign of wear to avoid pump malfunction.
Tips for Extending the Lifespan of Your Parts
To get the most out of your Willow Sync parts, handle them gently and avoid exposing them to extreme heat or direct sunlight, which can degrade silicone. Always use the correct size and type of parts for your pump model. Avoid using oil-based lubricants on the valves, as they can break down the material.
Rotate between two sets of parts if you pump frequently. This reduces wear and gives each set time to air-dry completely. Also, consider using the Reusable Breast Pads to manage leaks between pumping sessions, keeping your clothes dry and reducing the need for frequent washing of pump parts.
- Keep parts away from sharp objects that could puncture them.
- Use a gentle, fragrance-free soap to avoid residue buildup.
Mastering the installation and care of your Willow Sync backup parts set is key to a smooth pumping experience. By following these steps, you’ll ensure your pump operates efficiently, maintain hygiene, and extend the life of your parts. Remember to have a backup set on hand, replace parts as needed, and always prioritize cleanliness. Happy pumping!



