PART NO THREAD O-RING DIMENSIONS E F E A B L S1 S2 2OU-04 7/16''X20 1/4''X18 O904 9.1 4.6 26 14 19 2OU-04-06 7/16''X20 3/8''X18 O904 9.1 6 27.5 17 22 2OU-06 9/16''X18 3/8''X18 O906 9.9 6 28.5 17 22 2OU-06-08 9/16''X18 1/2''X14 O906 9.9 7.5 30 19 27 2OU-08 3/4''X16 1/2''X14 O908 11.1 7.5 33 22 27 2OU-08-06 3/4''X16 3/8''X18 O908 11.1 6 31 22 22 2OU-10-08 7/8''X14 1/2''X14 O910 12.7 7.5 38.5 27 27 2OU-12-08 1.1/16''X12 1/2''X14 O912 15.1 7.5 40 32 27 2OU-12 1.1/16''X12 3/4''X14 O912 15.1 8.9 41 32 32 2OU-12-16 1.1/16''X12 1''X11.5 O912 15.1 10.5 42.5 32 41 2OU-16 1.5/16''X12 1''X11.5 O916 15.1 10.5 42.5 38 41 2OU-20 1.5/8''X12 1.1/4''X11.5 O920 15.1 11.2 50 50 50 2OU-24 1.7/8''X12 1.1/2''X11.5 O924 15.1 11.2 50 55 55