GREEN SEAL is a uniquely formulated, environmentally friendly sealer designed for use in waterless no flush urinals. GREEN SEAL creates a non-soluble seal of a deodorizing liquid in the trap. GREEN SEAL also prevents unwanted sewer vapors from backing their way into the air. GREEN SEAL has a pleasant cherry fragrance to give instant and long lasting odor problems from dried out traps, keeping them wet and odor free. Easy to use, simply add it and forget it.