2500 psi working pressure Designed for series use Return fluid from one cylinder is used to actuate the next cylinder. The rod end area of the first cylinder is equal to the base end area of the second cylinder causing them to move at equal speed. Variations of the DC and DB Series, the DCR (master) allows oil to pass from one side of the piston to the other at the end of the extend stroke , thus compensating for any differences in fluid requirements. Each time the cylinders are fully extended they will be automatically rephased.