PART NO. THREAD OD TUBE O-RING DIMENSIONS IS F D F A B L S1 S2 1QO-16-06 M16X1.5 9/16"X18 10 11.89X1.98 19 9.93 35 19 19 1QO-18-08 M18X1.5 3/4"X16 12 16.36X2.21 18 11.13 37 22 22 1QO-18-10 M18X1.5 7/8"X14 12 19.18X2.46 18 12.7 40.5 27 22 1QO-22-08 M22X1.5 3/4"X16 14 16.36X2.21 19.5 11.13 38.5 22 27 1QO-27-08 M27X1.5 3/4"X16 18 16.36X2.21 20 11.13 41 30 32 1QO-27-10 M27X1.5 7/8"X14 18 19.18X2.46 20 12.7 42.5 30 32 1QO-27-12 M27X1.5 1.1/16"X12 18 23.47X2.95 20 15.09 46 32 32 1QO-30-12 M30X1.5 1.1/16"X12 20 23.47X2.95 23 15.09 49 32 36 1QO-30-16 M30X1.5 1.5/16"X12 20 29.74X2.95 23 15.09 49 38 36 1QO-33-12 M33X2 1.1/16"X12 22 23.47X2.95 26 15.09 52 36 41 1QO-39-20 M39X2 1.5/8"X12 28 37.46X3.00 26 15.09 56 50 46 Note: In case if you are interested to order the adapter in complete set with sleeve and nut ,it is necessary to insert suffix "RN" after our part no.,for example 1QO-18-08RN