ABEK2 organic, inorganic, ammonia and acid gases [Bp>65?C] 5000ppm Revolutionary EasyLock filter system with no additional clips or holders. Different gas and particulate filters can be combined. EasyLock? gas filters can either be used on their own or combined with the EasyLock? particulate filters. Any combination of filters possible, simply click together, there is no need for additional clips or filter holders. 1 BOX = 8 FILTERS (NOT PAIRS)