PART NO. THREAD O-RING DIMENSIONS E F F A B S1 S2 1SG4-02OG G1/8"X28 G1/8"X28 7.65X1.78 19 24 11 14 1SG4-04OG G1/4"X19 G1/4"X19 10.77X2.62 21.8 27 14 19 1SG4-06OG G3/8"X19 G3/8"X19 13.94X2.62 24 30 16 22 1SG4-08OG G1/2"X14 G1/2"X14 17.12X2.62 29.5 36 22 27 1SG4-12OG G3/4"X14 G3/4"X14 23.47X2.62 32.8 42 27 32 1SG4-16OG G1"X11 G1"X11 29.74X3.53 37 44 33 41 1SG4-20OG G1.1/4"X11 G1.1/4"X11 37.69X3.53 44.5 47.5 41 50 1SG4-24OG G1.1/2"X11 G1.1/2"X11 44.04X3.53 47.5 51.5 48 55