I briefly had that kind of shunt. That sounds like a menos. I did not work for me. When my doctor went to revise it, it fell apart and he put the Codmen back in. The codmen just works better for me because it adjusts in intervels of 10. I'm at 150. It can go 30, 40, 50, and so on up to 200. I just had an anti-syphen devise put in and it appears to be working. My doctor was just going to reposition the upper part and put an anti-syphen in, but when he went in to pull it up, it fell apart, so he put in a new one. I have a VA shunt. When I had a VP shunt, the distel end would get sore at times/