FILTERS (pair) suitable for FORMIUM ACID vapors(yellow color)-bayonet connection.The ABEK1 filter is an excellent filter that provides respiratory protection against inorganic gases and vapors, organic gases and vapors with boiling points above 65 ºC, sulfur dioxide and other gases, and acid vapors, ammonia and ammonia derivatives. It is a filter with bayonet connection for Air II semi-masks. (Code PI 0349)