Safety waste caps consistently trap vapors and liquids in safety cans and containers when storing or disposing hazardous material. The closures keep solvents clean while protecting handlers with leak-proof tight seals. Chemically resistant for even the most corrosive materials, the high-quality cap construction complies with safety codes and regulations for the work place. The strong carbon filters give maximum vapor protection and closures featuring automatic shut-off or funnels make overflow filling or dumping spills impossible.