Soviet Industrial BKF Gas Mask Filter

These Soviet Union gas mask filters were used in industrial settings and this model BKF (БКФ) was used against acid gases, organic vapors, arsenous and phosphorous hydrogen, dust, smoke and fog (Gasmaskwiki) 

These filters are sold for just collections purposes. We believe there is asbestos within the filter as all Soviet filters have and do not recommend breathing through these. 

These look almost identical to EO-16 filters but they are slightly shorter, have a colored plastic cap (white in this case although the normal metal caps from eo-16 can fit). 40MM GOST Threads.