Norgren rm8000m series iso cylinder magnetic piston double acting norgren rm8020m40 a double acting magnetic piston suitable for use with filtered compressed air lubricated or non lubricated the piston has a corrosion resistant design with stainless steel piston rod and barrel with aluminium alloy end covers additionally integral eye mounting and the supplied nose mounting nut and piston rod locknut make installation quick and easy norgren rm8020m40 20mm magnetic piston double