Traps dust particles and moisture condensation that is detrimental in air brushing in water spattering. Filter fit 1/4″ piping. Install to spray gun, air brush further away from the air compressor to allow air moisture condensation and removal. Install upright with outlet hose connection to top female screw thread. Press release valve at inlet to drain moisture condensant. A 2-in-1 practical gadget to prevent spray gun blockages and moisture removal.