Waterless-urinal sealants keep odors contained within waste lines to help maintain a pleasant atmosphere in restrooms. These liquids form a barrier atop a urinal trap or cartridge that allows urine to drain into the waste line while stopping sewer gases from rising out of it. They slowly drain away with each use of the urinal and can be reapplied as needed to restore the barrier. Waterless-urinal repair parts and accessories are used for cleaning maintaining and installing waterless urinals found in settings where water consumption is a concern. They help prevent damage or restore function to existing urinals and aid installation of new urinals. They re commonly used by maintenance and cleaning staff to keep waterless urinals in service. Waterless Urinal Sealant Universal Fit.