Piston and Rod Rubber Seal designed to provide a tight seal for hydraulic systems. Key specs: Wiper diameter of 71.60 mm (2.82 in), CUP seal type, width of 6.50 mm (1/4 in), and shaft diameter of 74.60 mm (2.94 in). Additional specs: Seal material is EPDM with a seal outer diameter of 64.50 mm (2.54 in). Made from high quality general rubber.