This is a compact filter unit for use with Air and Spray Guns. It fits into your Airline or directly onto a Spray gun to prevent water from contaminating paintwork. Air Tools and Spray Guns Prevent water from the Airline or Compressor from contaminating. Paintwork Includes a Condensation discharge valve. The Clear filter in the bowl allows a visual inspection of built-up moisture. It is removed through a spring-loaded valve at the bottom Filters dust, Oil and water condensation Filters Airborne solid contaminants such as pipe scale, rust and condensation from airlines. Standard 1/4" the thread will fit most spray guns and airlines.