Waterless 1101 1-Gallon BlueSeal Urinal Trap Liquid Long lasting and biodegradable trap seal liquid Has a specific gravity lower than water or urine Remains for an extended period of time in the trap with urinal use (small amounts do get carried out with each urinal use) Has zero evaporation at 100-Degree F and does not freeze above -70-Degree F The freezing feature allows facilities to eliminate or reduce urinal winterization costs