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The reversible sleeve air spring has a piston which is an additional component that the convoluted air spring does not have. The piston is the component that is fastened to the moving trailing arm or axle mount and, as a result, plunges in and out of the air cavity within the rubber bellows.
In general, a piston gives the reversible sleeve air spring an advantage over the convoluted air spring in that spring, rates can be further tuned using a variety of piston profiles. For straight-sided pistons, the reversible sleeve air spring has an advantage over the convoluted air spring, in that a constant load for a given internal pressure may be maintained over a range of heights.