How flat does your pump go while pumping?

[twosigma]

Hi guys
When I pump my titan coloplast, initially the bulb feels very hard. I can keep pumping until like 70-80%. After that, if I do a long press, I can feel the pump go almost flat but then it refills when I let go for the next pump.

I wasn't sure if you should ever feel the pump flattening during long presses.

Has anyone else experienced this?