Double-acting O-Ring energized piston seal with one or two corner reinforcements for dynamic applications. Installed in closed grooves, including grooves to ISO 7425-1, as piston Glyd Ring® . Low friction with no stick-slip, minimal break out force and high wear resistance with integrated Back-up Rings for higher pressures or larger gaps. Available in Turcon® or Zurcon® materials. The O-Ring is not included with this item.