Gasket dimensions for flat ring and full face applications ASME B16.21 class 150 Gasket dimensions for flat ring and full face applications More variations ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300 ASME B16.21 class 300