... grooves only, it is suitable for higher-pressure ratings starting at 2, 000 lbs and ending with 20, 000 lbs, incorporate a ... manufactured to fit the API 6A flange's groove, interchangeable with R(oval) and R(octagonal) series, bear pressure can reach ... these gasket performance excellent in 6B flange, suitable to the higher pressures with higher vibrations and heavier weights of these units. If you ...