A double-acting seal recommended for linear applications. It is designed to pass over holes/ports in the counter surface or to slide across mating surfaces that have dimensional changes from a small diameter with sealing function over the seal to a large diameter with no sealing function or vice versa. Split hardware is required and prevents the seal from pulling out of the groove while passing over ports or variable diameter counter parts. Available in Turcon® or Zurcon® materials. The O-Ring is not included with this item.