The need to drill deeper for oil, with a corresponding increase in pressures and temperatures, makes working in an already harsh environment even more challenging. At the same time, the current market price of oil is putting even greater emphasis on the need to control operating costs. To meet these challenges, SKF has designed a new and innovative wellhead seal, called the Locking T-seal. The seal features specially designed retention ridges that snap into place on installation, helping to prevent rotation or displacement and mechanically locking the anti-extrusion backup rings into the correct orientation.