Packaging - Aldrich gases are supplied as either compressed gases in standard lecture-bottle cylinders with an outlet valve or as liquefied gases packaged under their vapor pressure in small, low pressure cylinders with an outlet valve or plug. Regulators – use when pressure control is required for both compressed and liquefied gases. Purge Valves – use in conjunction with the gas regulator for corrosive gases to prevent damage to equipment due to gas hydrolysis. Control Valves – use when pressure control is not required or when a regulator is not recommended for a particular gas. Hose Barbs – use when pressure control is not required and to connect tubing to an outlet valve. Lecture-Bottle Dispensing Stations – fully integrated systems for the safe storage and dispensing of compressed lecture-bottle gases.