No-Flush seal for No-Flush urinals is a ready-to-use product. No-Flush is a long lasting liquid seal for no-flush urinals. It will remain in the trap for an extended period of time. It's primary purpose is to form a barrier over the urine in order to reduce and/or eliminate odors from escaping from the no-flush urinal. Designed not to evaporate or freeze in normal indoor temperatures.