PART NO. THREAD O-RING DIMENSIONS E F G G A B C S1 S2 AKKH-14-14-20OG M14X1.5 M14X1.5 M20X1.5 17.3X2.4 30 30 37 19 27 AKKH-18-18-14OG M18X1.5 M18X1.5 M14X1.5 11.3X2.4 30.5 30.5 35.5 19 19 AKKH-22OG M22X1.5 M22X1.5 M22X1.5 19.3X2.4 35.5 35.5 40 22 27 AKKH-22-22-20OG M22X1.5 M22X1.5 M20X1.5 17.3X2.4 35.5 35.5 40 22 27