If your Eufy pump's suction has started to feel weak, or you've just opened a fresh pack of replacement valves, getting the install right matters more than it might seem. The duckbill valve is an easy part to overlook, but getting it seated right makes a bigger difference than you'd expect. Here's how to install and remove it on your Eufy E10, E20, S1, or S1 Pro, plus a few things worth knowing along the way.
What the Duckbill Valve Actually Does
Before installing anything, it helps to know what this small part is actually doing. As your pump creates suction, the valve's tip opens to let milk flow through, then closes to help prevent backflow back toward the pump. It's a simple mechanism, but it's doing a lot of the work behind a smooth, consistent pumping session. When the valve wears out, that seal weakens, and suction is usually the first thing to suffer.
How to Install a Eufy Duckbill Valve
- Hold the bottom of the container up. This gives you a clear, stable view of the small hole where the valve sits.
- Insert the duckbill valve into the small hole inside the container using your thumb and index finger. Take your time here. The valve should sit snugly, not loosely balanced.
- Flick it gently to make sure it doesn't fall out. This is a quick way to confirm it's properly seated before you start pumping.
A note on fit: if you notice a visible gap between the valve and the flange after installing, don't worry, this is common. Press the valve again until the fit feels snug and the gap is less than 0.5mm. A little extra pressure here goes a long way toward avoiding suction issues later.
How to Remove a Eufy Duckbill Valve
- Flick the duckbill valve with your finger to remove it.
That's it, just one step. The trick is technique, not force. The valve can get slippery after a pumping session, so a quick, confident flick usually works better than trying to pinch or pull it out.
Troubleshooting Common Issues
Duckbill keeps popping off.
This is almost always a residue issue. Milk residue can make both the valve and the flange slippery, which makes it harder for the valve to stay seated. After each use, wash both pieces with hot, soapy water and let them dry completely before reinserting. If the valve keeps popping loose even after a thorough wash, a vinegar soak can help break down any leftover grease that plain soap missed.
Suction feels low.
Start by checking the tip of the valve for cracks, stretching, or softness. Clean it thoroughly, including between the lips, since residue buildup in that small space is a common culprit. If the tip looks worn or won't close fully even after cleaning, it's likely time to replace the valve.
There's a small gap between the duckbill lips. Is that normal?
Yes, this is expected. The pump's suction closes the gap during use, so it doesn't need to be sealed at rest. That said, if the gap stays wide even after cleaning, or doesn't close once the pump starts running, that's a sign the valve has lost some elasticity and a replacement may be in order.
Caring for Your Valve Between Uses
- Hand wash only. Skip the dishwasher.
- Boil for 3 minutes before first use to sanitize. Make sure the valve is fully submerged while boiling, and never microwave it dry.
- After each session, detach, wash with hot soapy water, and let it air dry completely. The faster it dries, the lower the chance of mold.
- Replace the valve regularly, or as soon as you notice suction performance dropping. Most moms find every 2 to 3 months is a reasonable rhythm with daily pumping, though heavier use may call for sooner.
A quick safety note: these valves contain small parts and aren't intended for children under 3 years.
Need a fresh set? Shop Eufy Compatible Duckbill Valves →
