DSI Glyd Ring are double acting composite rod seals composed of a filled PTFE friction ring and pre-tightened rubber O-ring. They can be assembled in grooves according to standard ISO 7425/2. For reciprocating hydraulic systems. Excellent performance in high, medium, low pressure and high load, high frequency conditions. Especially suitable for long strokes. Suitable for larger rod diameters in fluids and high pressures such as bulldozers, excavators, forging machines, brick presses, rolling mills, servo valves and other machine tools.