Glyd Ring® Hz is a symmetric single- and double-acting rod seal for applications with short-stroke high-frequency linear movements. It is designed to fit into ISO 7425-2 housing grooves. Glyd Ring® Hz is wider than Glyd Ring® giving a tighter fit in the housing groove and limiting its axial movement. Glyd Ring® Hz has notches on both sides to ensure system pressure can instantly activate the O-Ring under the seal despite the tighter fit and the fast alternation of pressure direction. Available in Turcon® or Zurcon® materials. The O-Ring is not included with this item.