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Bilstein Monotube (Gas)
In more than 30 years since Bilstein
introduced the world's first production monotube gas pressure shock absorber, no
other shock manufacturer has been able to equal its performance.
The Bilstein name today
graces not only shock absorbers, but also single and dual tube Macpherson strut
style suspensions.
Bilstein's monotube design exposes the shock body to maximum air flow,
lowering the operating temperature of the internal components and fluid,
extending life. 
The
nitrogen gas is separated from the superior grade oil by a specially designed,
close tolerance, floating piston. This design maintains constant pressure
against the hydraulic fluid, absolutely eliminating fluid aeration and
performance loss that is common to conventional twin tube design shocks.
The self-adjusting working piston, with spring-steel valving discs, precisely regulates oil flow for optimum compression and rebound control. There are no check valves or springs to wear out. The induction hardened steel piston rod is the strongest in the industry. The self-lubricating rod guide and end seal insures longevity and prevents leakage. These unique design features function in unison to allow Bilstein shocks to operate at peak performance levels for life.