Nominal Size B C D L O Ring
8 1/4 14.3 22 9.6 9.4 37 P16
10 3/8 17.8 25 9.6 12.7 38 P20
15 1/2 22.2 32 9.6 16.1 40 G25
20 3/4 27.7 38 12.7 21.4 45 G30
25 1 34.5 46 12.7 27.2 57 G35
32 11/4 43.2 55 12.7 35.5 57 G45
40 11/2 49.1 62 12.7 41.2 64 G50
50 2 61.1 75 15.9 52.7 72 G65