PART NO. THREAD O-RING DIMENSIONS E E A L S1 4ON-04 7/16"X20 8.92X1.83 9.1 11.5 5 4ON-05 1/2"X20 10.52X1.83 9.1 11.5 5 4ON-06 9/16"X18 11.89X1.98 9.9 12.2 6 4ON-08 3/4"X16 16.36X2.21 11.1 14.3 8 4ON-10 7/8"X14 19.18X2.46 12.7 16 10 4ON-12 1.1/16"X12 23.47X2.95 15.1 19 14 4ON-16 1.5/16"X12 29.74X2.95 15.1 19 17