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The EAS Dryer is an essential and often overlooked EAS component. The primary function of the EAS dryer is to absorb moisture from the compressed air in the EAS system. A potentially bad situation could arrise if moisture contained within the compressed air froze or corroded metalic components. This is not a huge issue for drier climates but the vehicle was designed in the United Kingdom and I hear it gets wet there sometimes.
The EAS Dryer is connected to the high pressure tank through a Non-return check valve and the oring fittings should be checked when hunting down slow leaks.