The Trelleborg Turcon® Variseal® HF is a single-acting axial/face sealing element comprised of a U-shaped Turcon® ring and a coiled metallic energizing spring. This design ensures gas-tight sealing even at low temperatures. It is resistant to most liquids and chemicals and has unlimited shelf life.--A single-acting sealing element containing a robust helical spring, optimized for sealing high-pressure fluid and gas.