Can i substitute spectra flange with medela's if using spectra pump?

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Yes, if you're referring to the motor. You may also find spectra flanges on shopee, with $10 Off first purchase https://shopee.sg/product/242594539/7732031072?smtt=0.0.9

i believe you can't as medela flanges are different from spectra due to the backflow protector

Not to my knowledge.

I don't think so.