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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🔄 Keep your pump flawless, your routine unstoppable!

SAFE NON TOXIC - Crafted from BPA and DEHP-free materials for peace of mind.
LEAK PROOF RELIABILITY - Includes 2 silicone membranes designed to prevent spills and maintain suction.
COMPLETE REPLACEMENT KIT - Everything you need in one pack—4 O-rings and 2 membranes for hassle-free maintenance.
SEAMLESS PUMP PERFORMANCE - Keep your Medela Harmony running like new with 4 precision O-rings.
DURABILITY MEETS CONVENIENCE - High-quality silicone parts built to last, so you never miss a pumping session.

The Maymom O-Ring and Membrane Replacement Kit for Medela Harmony includes 4 silicone O-rings and 2 membranes made from BPA and DEHP-free materials, ensuring safe, durable, and leak-proof pump performance. Perfect for maintaining optimal suction and hygiene in your breastfeeding routine.

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