Review on Maymom Brand Bottle Parts Compatible With Philips Avent Natural Bottles, Avent PP Bottles Or Natural Glass Bottles (Sealing Disc) by Marcus Hussain

I bought this set to go with bottles for my Spectra pump (these work with the bottles the pump comes with as well as Nene bottles from Revain that all connect to the pump). Initially, I only washed and steamed them in my microwave device. They leaked immediately. I then read reviews that you need to actually BOIL THEM to fit properly. So I boiled them for 4-5 minutes and they’ve all been perfect ever since. No leaking. No issues. I also read that you can strip the tracks if you over tighten them, but I just wonder if this occurred because people tried to correct a leak if they didn’t boil them. I don’t find myself feeling the need to over tighten them, I just screw them on normally. I would buy these again! Just BOIL THEM first!