Discontinued by the manufacturer and is no longer available. Sorry! July 2009. If you need this part, you wil have to upgrade your system to the new style fittings TA10058 and TA01060. 02-83 is for original A-5 style Response Trigger systems. 02-80, 02-83, 02-85 all work together. TA10058 and TA01060 are the new style fittings and are not reverse compatible. 02-83 on some diagrams. TA01083 on others. Does NOT include 02-84 orings. 02-84 oring is used in all three oring slots. The outer slot is slightly larger, but uses the same oring.