I have been looking for a replacement for the thin and tight one that came on my pump (not same brand). Most were too tight for me to grow to capacity and the others didn't allow for a good vacuum seal. This is perfect. It's wide for girth and the seal is great everytime.
This comfort pad "doughnut" replaced the flimsy and uncomfortable rubber sleeve that came with my pump. This pad makes it comfortable and easy to use my pump and leave it in place for more extended periods of time without any discomfort. The only downside is that I may have purchased too skinny of a pump. When it works it's magic, I'm thick enough for the fairly large opening to be a tight squeeze. Nothing a little lube won't cure!
This works great and will stretch over the bigger cylinders. I ordered the wrong cylinder and had to get a larger one. This comfort pad fit over both without any issue and is very comfortable.