When to Replace Your Pump Parts: A Pump-by-Pump Guide

Here's something no one mentions at the baby shower: the little silicone bits on your pump don't last forever. They stretch and soften so gradually that there's never one moment where something obviously breaks. Instead, you just slowly start to wonder if your pump is phoning it in.

Good news first. Most of the time, it's not you, and it's not your pump. It's a tiny, inexpensive part that has simply done its job a few hundred times and is ready to retire.

Whether you're exclusively pumping, combo feeding, or pumping a few bottles for daycare, this guide walks you through it. We'll cover how to spot a worn-out part in seconds, how your pumping routine changes when each piece needs swapping, and exactly which Legendairy Milk parts work with the pump sitting on your nightstand.

Your pump motor creates suction, but the soft parts are what hold it. Duckbill valves, membranes and backflow protectors open and close with every single cycle. Multiply that by every session, every day, and even the toughest food-grade silicone eventually gets a little tired. That wear happens so gradually that it's easy to miss, which is why a quick check beats waiting until you notice.

Heat speeds things up, too. Steam sterilizers and harsh detergents can warp delicate silicone and make parts wear out faster. That's why we recommend boiling new parts once before first use, then hand washing in warm, soapy water after each session. Cold or UV sterilization is fine if you prefer it.

Once they're clean, let your parts air-dry completely on a clean towel somewhere protected from dirt and dust. Skip rubbing or patting them dry, which may transfer germs.

Want the full cleaning rundown? Our Washing Pump Parts: Tips + Hacks guide has you covered.

If you only remember one thing from this post, make it this:

1. Assemble your pump parts the way you normally would.

2. Turn your pump on.

3. Watch the tip of the duckbill valve.

A healthy duckbill pulls closed at the tip when the pump is running. If it looks floppy and isn't closing properly, it's time for a new one. That's it. Five seconds, no guesswork.

Quick reassurance: if a brand-new duckbill arrives with a slight gap at the tip, it's not defective. The check that matters is what it does with the pump on.

There's no single replacement date that works for everyone, because parts wear out based on how much you use them.

Picture two people with the same pump. One pumps a single bottle a day for daycare. The other is exclusively pumping around the clock. Same parts, very different mileage. The second person's valves and membranes open and close far more often, so they'll need fresh ones sooner.

So instead of one date on the calendar, use two tools: a starting point from the table below, and a quick look at the part itself.

Every interval below depends on how often you pump. If you're pumping a lot, plan on the earlier end of a range, or sooner if a part shows wear. Where there's no set interval, the part itself tells you when it's done.

You're already taking everything apart to wash it, so that's the perfect moment to give each piece a quick once-over. When you put it all back together, do the five-second duckbill check before your next session.

Here's the nice part: pump more often, and you wash more often, so you naturally check more often. Your routine scales with you. No math required.

• A duckbill is floppy or not closing at the tip with the pump on.

• Any part is torn or damaged, no matter how new it is.

Pro tip: set a phone reminder when you open a fresh pack, then adjust it to your life. If your checks keep catching worn parts before the reminder goes off, move it earlier next time. Future you, running on four hours of sleep, will thank you.

You know your pump by name, so let's start there. Find yours below and you'll see every Legendairy Milk part that works with it, plus where to find assembly help.

• Duckbill Valves with Pull Tab: our pink duckbills, with a pull tab so you can pop them off your shield without tearing them.

• Flange Inserts: fit most traditional 24/25 mm plastic breast shields, in sizes 13 to 21 mm.

• Silicone Collection Cups: compatible with S1, S2, M1, 9+, 9S and Synergy Gold. See how to use Adapter A with Spectra tubing.

• Using FluidFit shields? Here's how to connect them to your Spectra.

• Duckbill Valves with Pull Tab: Harmony, Symphony, Swing and Lactina.

• Silicone Collection Cups: Pump in Style Advanced, Pump in Style with MaxFlow, Sonata, Freestyle, Freestyle Flex, Swing Maxi and Swing. See how to use Medela's tubing with Adapters A and B.

• Using FluidFit shields? Here's how to connect them to your Medela.

• Mini Duckbill Valves with Pull Tab: the mint green ones, sized for the Lansinoh Manual, Signature Pro and Smartpump 2.0.

• Imani Duckbill Valves, Imani Valve Base, Imani Inserts (17, 19, 21 and 25 mm), Imani Breast Shields and Imani Clear Cups.

• Need a refresher? How to Assemble Your Imani i2.

These have their own dedicated spares. Our pink and mint duckbills will not fit them.

• Spare Duckbill Valves (set of 4)

• Spare Backflow Protectors (set of 2)

• Spare Y-Shape Tubing with Adapters and Spare Adapters A&B

• Spare Breast Shields and Spare Cup Parts

• Step by step: How to Assemble Legendairy Milk's Silicone Collection Cups

Our pink duckbills also fit the Ameda Mya (not Mya Joy), Baby Buddha, Motif Luna and Duo, Hygeia EnJoye and Fit, and Zomee Z1 and Z2. Our mint mini duckbills fit the Ameda Elite, Finesse, Mya Joy, Purely Yours and Platinum, Ardo Calypso and Carum, and Hygeia Evolve.

Still not sure? Every product page lists its full compatibility, and our team is happy to help at info@legendairymilk.com.

Hearing a little air while you pump? Some audible air is normal. It's part of how suction control works, not a sign that something's broken. So before you take everything apart at midnight, take a breath.

If your pump feels like it's lost its grip, work through this quick list before you assume the worst:

• Check the assembly. Make sure every piece is fully seated and every connection is snug.

• Do the five-second duckbill check. A floppy valve is the most common culprit.

• Look at your membranes and backflow protectors. Stretched, torn or damaged? Swap them.

• Inspect your tubing and adapters. Anything torn, cracked or damaged gets replaced.

• Recheck your fit. Bodies change throughout your feeding journey, so a shield or insert that felt great in month one may not feel the same now. Our Silicone Nipple Ruler makes rechecking easy.

If you've replaced the worn parts and pumping still feels off or uncomfortable, reach out to a lactation professional or IBCLC. Sometimes it takes a second set of eyes, and that's completely okay.

Nope. The Silicone Collection Cups use their own Spare Duckbill Valves. The pink duckbills also don't fit the Imani i2.

We don't recommend it. High heat can make silicone wear out faster and can warp hard plastic pieces. Boil new parts once, then hand wash. Cold or UV sterilization works too.

Yes. Sterilize new parts by boiling them before first use. Each product page lists the exact time.

Pump parts are not returnable, so double-check compatibility on the product page before you order.

Pump parts are small, but they do a big job. A quick check every so often, a fresh set when yours are worn, and a reminder on your phone can save you a lot of mid-session frustration.

You've already got enough on your plate. Your pump parts shouldn't be one more thing to stress about.

Ready to restock? Shop all Pumping Accessories and find the parts made for your pump.