Scooter rear shock gas absorbers YSS for Piaggio Beverly Carnaby 125/200/250/300. YSS DTG gas shock absorbers are equipped with an internal double tube emulsion gas tank. Stock oil and gas in the outer chamber promotes durability and smoothness. The shock is adjustable for preload by turning the adjustment ring in the spring. Is designed and built to suit the specifications of the model on which it will be installed.