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.

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Replacement Parts for Medela Harmony Manual Pump; 4 O-Rings and 2 Membranes

Product ID: 48780742

Details

Brand
Maymom
Colour
White
Dishwasher safe?
No
Item weight
0.2 Ounces
Material
Silicone
Material Type Free
BPA Free

🔄4 O-rings for seamless pump performance

⚙️2 durable membranes for optimal suction

🛡️BPA & DEHP-free safe silicone

¥3199

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🍼 Keep your pump flawless, your feedings flawless!

COMPACT LIGHTWEIGHT - Slim 7.5 x 5 x 0.4 cm design fits effortlessly into your busy lifestyle.
TRUSTED QUALITY FIT - Perfectly compatible replacement parts from Maymom, rated 4.6 stars by thousands.
HEALTH FIRST MATERIALS - Crafted from BPA and DEHP-free silicone for worry-free feeding.
SEAMLESS PUMP MAINTENANCE - Keep your Medela Harmony running like new with 4 precision O-rings.
ENHANCED SUCTION RELIABILITY - Includes 2 membranes engineered for consistent, efficient pumping.

This replacement kit for the Medela Harmony manual pump includes 4 silicone O-rings and 2 membranes made from BPA and DEHP-free materials. Designed for durability and optimal suction, these parts ensure your pump maintains peak performance. Lightweight and compact, they offer a trusted, health-conscious solution favored by thousands of parents.

Specifications

ASIN	B016Y51X5U
ASIN	B016Y51X5U
Best Sellers Rank	4,633 in Baby Products ( See Top 100 in Baby Products ) 87 in Breast Pumps & Accessories
Brand Name	Maymom
Colour	White
Country Of Origin	Taiwan
Country of origin	Taiwan
Customer Reviews	4.6 4.6 out of 5 stars (1,631)
Customer reviews	4.6 4.6 out of 5 stars (1,631)
Global Trade Identification Number	00760488883082
Guaranteed software updates until	unknown
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
Size	One Size
Special Features	Bpa Free
UPC	760488883082
Unit Count	1 count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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