China The Od Type Piston Rod Seal Is a Two-Way Piston Seal Composed of a PTFE Piston Seal Ring and an O-Ring for a Hydraulic Cylinder., Find details about China PTFE Od Straight Seal, Hydraulic Cylinder Piston Rod Oil Seal from The Od Type Piston Rod Seal Is a Two-Way Piston Seal Composed of a PTFE Piston Seal Ring and an O-Ring for a Hydraulic Cylinder.