A twin-tube shock absorber consists of two concentric tubes. The inner tube known as the pressure tube has the piston attached along with the hydraulic fluid. As well, the outer tube known as the reservoir tube has additional hydraulic fluid. It permits the fluid to either expand or contract while the shock absorber is utilized. While compressing or extending the shock absorber, the piston lifts and lowers the pressure tube filled with hydraulic fluid. The pistons have valves that control the fluid movement and create resistance thus dampening movement. Twin-tube shock absorbers are commonly found in many mass production vehicles due to their relatively simpler mechanical structure. They offer good performance versus cost which provides reasonable ride comfort and handling while driving compared to other vehicles.
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