Rosebud cylinder

I am really interested in trying a rosebud cylinder. I have questions though. I am a seasoned extreme anal player. I can insert a 4" diameter toy with little warm up. So how much and how long do you leave vacuum on? Also how long do you stay that way? And how would you say it feels?

What is a rosebud cylinder?

Anal pumping is not the best thing to do , i say avoid it

Sounds like a very risky activity to me. A bowel rupture will change, if not end, your life.