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shock absorbers external upper mounting hole nitrogen compressed air orifice preload adjuster coil spring dust seal slider rod lower mounting hole internal oil bleed bolt nitrogen compressed air chamber upper floating slider seal oil specific viscosity slider seal adjustable valve shims for adjustable damping oil seal o-ring dust seal slider rod question why does there have to be an air chamber inside the shock absorber answer as the slider rod moves into the shock absorber body it occupies more volume space inside oil like all liquids is for most practical purposes incompressable if the air chamber wasn't there the slider rod wouldn't be able to move into the shock absorber body hydrolock