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.

O Ring And Membrane For Medela Harmony

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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€ 20.98

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Restore your pump’s power—because every drop counts!

SAFE NON TOXIC - Crafted from BPA and DEHP-free silicone for peace of mind during every pump session.
TRUSTED BY THOUSANDS - Rated 4.7 stars by over 1,500 parents who reclaimed their pump’s suction power fast.
LIGHTWEIGHT COMPACT - At just 5.67g and pocket-sized, these parts fit seamlessly into your busy lifestyle.
COMPLETE REPLACEMENT KIT - Includes 4 O-rings and 2 membranes to restore your Medela Harmony pump’s peak performance.
EFFORTLESS PUMP MAINTENANCE - Easy-to-install parts that keep your manual pump running like new—no need for costly replacements.

This replacement kit for the Medela Harmony manual breast pump includes 4 silicone O-rings and 2 membranes, all made from BPA and DEHP-free materials. Designed to maintain optimal suction and hygiene, these lightweight, durable parts ensure your pump performs like new, backed by high customer satisfaction and trusted safety standards.

Specifications

ASIN	B016Y51X5U
ASIN	B016Y51X5U
Additional Features	Bpa Free
Best Sellers Rank	#6,294 in Baby Products ( See Top 100 in Baby Products ) #42 in Breast Pump Parts
Brand Name	Maymom
Color	White
Customer Reviews	4.7 4.7 out of 5 stars (1,585)
Customer reviews	4.7 4.7 out of 5 stars (1,585)
Global Trade Identification Number	00760488883082
Is Discontinued By Manufacturer	No
Is the item dishwasher safe?	No
Item Weight	0.2 Ounces
Item model number	M022-4O2M
Manufacturer	Maymom
Manufacturer	Maymom
Manufacturer Part Number	M022-4O2M
Material Type	Silicone
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
Product Dimensions	7.5 x 5 x 0.4 cm; 5.67 g
Product Style	SD253
Size	One Size
UPC	760488883082
Unit Count	1 Count

Reviews

P**C

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

C**R

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

M**K

Helpful.

18.04.2025

S**N

Zonder o-ring trekt de kolf niet vacuüm

15.08.2023

S**H

When I use my pump, I realised that I lost o-ring and couldn’t use pump at all. So I wanted to get it ASAP. Then I found this product, made me very happy. Oder immediately. The product came so quick and perfect replacement. I couldn’t find something like this any other place, so very happy!

7.12.2019

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

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