I have the M5 and the suction is starting to get weaker. I've read this is a time to start replacing parts. Any idea what I actually have to replace? Is it all the plastic bits?
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Love my M5, as long as I keep up on the replacement parts. It's the diaphragm and the duckbills you need to replace for better suction. I notice the diaphragm seems to wear quicker than the duckbill for me. Not all replacement parts are created equal, so if you replace them and the suction is still off, then try a different brand parts. Took me far too long to figure that out.

@Brianna thank you. When you say different brand parts do you not always use momcozy ones? So many compatible ones on amazon

I use a generic one on Amazon. It works great. I've used the Momcozy ones as well and certain generic ones work just as well for me. I can try to find the description for you to search if you'd like.

@Brianna that would be really helpful thank you

8Pcs Duckbill Valves and 4Pcs Silicone Diaphragm Compatible with Momcozy M5, Replacement M5 Pump Parts Accessories Made by Tbuymax, Not Original Momcozy Pump Parts
I've bought these 3 times and they've done really well for me. I had an AWFUL experience woth the Juome brand. I thought my supply was taking but the parts were just bad.

@Brianna thank you so much!

The Momcozy ones aren't too experience, but i have two sets because I'm on the go a lot, so my Replacement cost is doubled which is why I go with these.