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I cannot believe how long I waited to get these, I'm almost kicking myself for waiting so long. I originally purchased the 19mm for my 15mm nipples thinking that would be the best fit, but after a long stint of painful, unproductive pumping, I finally decided to purchase the 17mm in hopes of a better result. I am shocked at the difference 2mm has made. It's like night and day. There's no pain at all now and the output has also significantly increased. Wow. Just wow. I am so happy!
I’ve been using these for months now. I ordered different sizes till I finally got to these as the ones that fit me best, as the ones i got with the pump (originals) were too large and in Canada it’s waaaaaay to expensive to get original replacements. Anyways, there is no difference. They work as they should and I’ve been buying other replacement parts from this brand as well. If my production dips it definitely isn’t due to the plastic, it’s cause I skipped pumping or wasn’t drinking enough water or whatnot. I recommend