... cylinderMaterialSteel,20#,45#,Aluminium, bronzeComposeHydraulic body, Hydraulic piston, Hydraulic RodHydraulic clinder typesPiston,plunger,piston, telescopic,SwingoutInside Surface ... and pushes against all sides. The hard steel body prevents the hydraulic fluid from escaping.Hydraulic PistonThis ... need very high pressures. This gasket moves with the piston which produces the high internal pressure ...