Windlass Ring Joint Gaskets or RTJs are made to withstand extreme pressures and temperatures while being used in highly corrosive environments. They meet or exceed API-6A specifications and are available in soft iron, low carbon steel, SS 304, SS 316 and other exotic alloys for specialty applications.Standard ring joint gaskets with octagonal cross section and designed for flanges with standard ring joint grooves. Inter changeable with oval section gaskets on modern octagonal grooved flanges. Available from R11 to R105.