4.0 out of 5 stars

A necessity for the average person

I needed to buy a larger size than included with the pump. It made pumping much more comfortable and successful. I only wish that you didn't need to buy each size separately. It is hard to know which size to choose.

5.0 out of 5 stars

more comfortable than the original one

The shape is better

edges are smoother

it's a bit shorter too so it's alot more comfortable than the one I got with the pump. It came with the 24mm

which was fine for me to use. But these 21mm are even better.