Okay, so full disclosure - I was THIS close to buying a whole new Medela Harmony pump because my suction was getting weak. Then I found these Maymom replacement parts and wow, game changer!

The package came with 8 o-rings and 4 membranes (which is great because I'm clumsy and lose these tiny pieces constantly). Installation was super easy - just popped them in and my pump worked like new again.

What surprised me most was the quality. These feel exactly like the original Medela parts but at a fraction of the price. Been using them daily for about 6 weeks now with no issues.

Pro tip: The o-rings are TINY (like, 'might disappear into another dimension' tiny) so be careful when cleaning them. But having spares means I don't panic when one inevitably goes missing!

Only complaint? Wish they included more membranes since those wear out faster. But overall, this little $7 package saved me from spending $50+ on a new pump. Total lifesaver for breastfeeding moms on a budget!