Brass unit and flexible tubing, stainless steel adjustment knob and copper coated spiral cover of control cable. Two spare fittings and two description cards. Decarbonizes the engine, sends a constant stream of moisture to the engine.Patented and patents pending in USA and foreign countries. VIX Vapor humidifier, Wheaton, ILL, USAengine humidifier, walter g. critchlow, vix vapour humidifier, vix vapor humidifier