Ostoform FLOWASSIST Urostomy Pouch.This item forms one half of a 2-piece pouching system. The FLOWASSIST Urostomy Pouch, is made from Polyethylene Fleece, a fast-drying material that prevents electrostatic build-up. It features a backstop to hinder urine return to the stoma and a resealable tap-style drainable outlet. It includes a set-in window and an integrated coupling system for attachment to the baseplate by pressing the two plastic click rings around the floating flange.