Compressed-air treatment products help pneumatic equipment run smoothly by improving the quality and controlling the flow of compressed air. Air-line lockout valves help prevent air-operated equipment from being accidentally started. Dirt, moisture, and other contaminants are trapped by compressed-air filters, which purify the airflow. Compressed-air lubricators help pneumatic components last longer. Air pressure exiting the compressor is monitored by compressed-air regulators. Desiccant, membrane, and regenerative air dryers remove water vapor and oil aerosols from compressed air to give a clean, dry stream. Filter-regulators and filter-regulator-lubricators are all-in-one units that do not require the usage of separate components. Oil/water separators are used to keep oil out of compressors.