Description This listing is for 2 FILTERS (A Pair) One premium mini in-line air filter. Separates and removes oil, water and dirt Use for compressor air lines, air tools, spray guns Clear reservoir shows accumulated contaminants Push button drain release valve In-Line Air Filter, Oil and Water Separator - Drain Valve, Water Trap, Air Dryer, Removes Moisture, Dirt - Use on Compressor Air Line Hose, Pneumatic Air Tools, Paint Spray Guns .