A ring joint face design has a grooved slot in which a metal ring gasket is inserted to creating a seal with mating flange. The metal ring is available in oval or octagonal shape. Most common material for ring joint gasket is 316 stainless steel which makes it ideal for corrosive applications A ring joint face design has a grooved slot in which a metal ring gasket is inserted to creating a seal with mating flange. The metal ring is available in oval or octagonal shape. Most common material for ring joint gasket is 316 stainless steel which makes it ideal for corrosive applications