I don't need the membranes (I have 10+ spares), can I just get the o-rings?

sorry. that is the only package we sell.

Where do the o rings go?

They go on to the pump handle diaphragm stem. If you ever lose suction it's most likely because one of these came off. Search for "medela hand pump o ring" images in your web browser to see a visual

What are the dimensions of the O-rings?

I don't know the exact measurements of the O-rings but I do know that if you are trying to replace a part for a Medela manual breast pump if it's perfectly.

Maymom O Ring And Membrane For Medela Harmony

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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£24.31

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Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔄 Keep your pump flawless, because every drop counts!

SAFE SOUND - Crafted from BPA and DEHP-free silicone for worry-free pumping.
PRECISION FIT - Designed specifically for Medela Harmony to ensure leak-proof, efficient pumping.
TRUSTED QUALITY - Backed by 4.7-star reviews and a top rank in breast pump parts—join thousands of satisfied parents.
LIGHTWEIGHT COMPACT - At just 5.67g and slim dimensions, these parts won’t weigh you down.
COMPLETE REPLACEMENT KIT - Includes 4 O-rings and 2 membranes to keep your Medela Harmony pump performing like new.

The Maymom O-Ring and Membrane set is a premium replacement kit for the Medela Harmony breast pump, featuring 4 silicone O-rings and 2 membranes made from BPA and DEHP-free materials. Lightweight and precisely engineered, this kit ensures optimal pump performance and hygiene, trusted by thousands of parents with a 4.7-star rating.

Specifications

ASIN	B016Y51X5U
Additional Features	Bpa Free
Best Sellers Rank	#11,997 in Baby Products ( See Top 100 in Baby Products ) #59 in Breast Pump Parts
Brand	Maymom
Brand Name	Maymom
Color	White
Customer Reviews	4.7 out of 5 stars 1,648 Reviews
Global Trade Identification Number	00760488883082
Is the item dishwasher safe?	No
Item Weight	0.2 Ounces
Manufacturer	Maymom
Manufacturer Part Number	M022-4O2M
Material	Silicone
Material Type	Silicone
Material Type Free	BPA Free
Material type free	BPA Free
Model Name	Maymom O-Ring and Membrane for Medela Harmony
Model Number	M022-4O2M
Number of Items	1
Operation Mode	Manual
Operation mode	Manual
Product Style	SD253
Size	One Size
Special features	Bpa Free
UPC	760488883082
Unit Count	1 Count

Reviews

T**.

Replacement o-ring worked

Why doesn't medela sell a replacement o-ring? Crazy. This replacement set did the trick and saved me from having to buy a whole new pump!

5.09.2026

P**C

Perfectos

Era lo que estaba buscando ya que se me desgasto la goma de mi sacaleches manual (Medela) y ha funcionado perfectamente como si fuera nuevo asi que muy contenta con el resultado. Llego super rapido y en muy buenas condiciones.

5.05.2026

A**A

Great pump pieces

Very happy with these pieces. Needed an o ring for Medela hand pump and it works perfect

27.08.2026

M**Y

Adecuados

Me costó trabajar conseguirlos pero vienen varios por si se pierde el empaque del extractor manual ❤️

2.01.2024

C**R

Wieder wie neu

Super gut. Meine Pumpe funktioniert wieder. Die Saugkraft ließ extrem nach und dank den neuem O-Ring funktioniert alles wieder und ich muss mir keine neue kaufen.

30.04.2025

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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£24.31

Duties & taxes included

In stock

Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to UK.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago