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Designed to meet the requirements of ASTM G85 annex A4, this optional accessory provides a chamber mounted dispersion tube, through which SO2 gas can be introduced, at a rate determined by the user adjustable control valve, and monitored by an SO2 gas flowmeter. The gas can be switched on and off automatically, at user programmable times. The control system fitted to Ascott CCT chambers enables the user to program whether SO2 gas dosing is conducted alone, for tests such as ASTM G85 annex A4, or in sequence with other climates, to form a cyclic corrosion test, for automatic execution by the chamber. For completeness, the operation of the salt spray components and systems of the chamber, are also described below. This is because SO2 gas dosing is usually undertaken whilst salt spray testing.