Most PU pole hose works well. The least flexible it is the better for operating the Univalve.
However, in my experience the least flexible it is the greater problems I've had with it laying flat, and a hose that won't lay flat is a trip hazard to both ourselves and to others. The best PU hose I've worked with to date has been Gardiners green. I can't comment on the most recent version. The original one was so tough I'm still using it and probably will be for some time to come