POUCH, OST SENSURA 1PC FLAT TRANS CTF 3/8-3" (10/BX) Cut-to-Fit Anti-reflux valve - prevents the urine from washing over the stoma, reducing the risk of urinary infections. Soft tuck-away outlet - easy to use and can be tucked away when not in use. This prevents it from rubbing on your leg, offering more comfort and discretion. Multi-chambers - the pouch has been divided into chambers which spread the urine evenly within the pouch. This allows it to have a flat and discreet profile while reducing splashing sounds.