This is a DEV130502 DS20 Dessicant Snake. The unique design combines desiccant drying down to -40F dew point with built dirt & oil aerosol filters. Replaces old technology at gun bulb filters. Significantly reduces paint defects from air line moisture. Mounts inline with air hose. Simple 2-minute installation. Suggested to be used with the RH1-01 relative humidity indicator for easy tracking of dessicant performance.