A single-acting Trelleborg O-Ring energized rod seal with hydrostatic ventilation for use in dynamic applications. Prevents pressure build-up between seals in all service conditions. Low friction with no stick-slip, minimal break out force and high wear resistance. Recommended for use with a secondary rod seal in Turcon® material, together with a double-acting Excluder® or Scraper.--Single-acting, rubber-energized plastic faced seal. Includes an O-Ring.