Replace often
"I bought these as a replacement for the ones that originally came with my pump. I am an exclusive pumper, I use my Elvie Stride 2 AT LEAST twice a day every day. Sometimes it's closer to 5 times a day. I didn't realize that the suction and seal wasn't as good after about 6 weeks of use. Definitely buy these to replace yours on a regular basis. I stopped having leaks, I got better output. I wish I had done it sooner."