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It is a single tube, monotube. It essentially has a reservoir in line
at the base of the shock. In circle track world they call it a base
valve. And it is pressurized.
A twin tube has concentric tubes and oil flows from one tube to the
other. In between the two tubes is a valve usually called a foot
valve. Twin tubes are rarely pressurized but those that are have the
gas mixed in the oil. That is called emulsion. AST 4200 keeps the gas
and oil separated.
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