Heavy Large 4.75" Hydraulic Cylinder Piston Head?? Markings on item: 2CC7811 S-1 40625500N00000101 It's 4.75" in diameter - 2.0" thick. It's a solid piece of metal and weighs almost 10 lbs. Not exactly sure what this is or what it goes to. It's big and heavy - I think it's a piston head for a hydraulic or pneumatic cylinder. If nothing else it makes a pretty beefy paper weight. please ask questions. Will ship international.