Combines the versatility of an inflatable plug with pressure induction capabilities. Great for inducing through Jandy Valves or other hard to reach spots. 550BP, 550Q, 555BP come with male quick connect to match Anderson Pressure Tester. To induce air for testing O560 and O565 require a CP18(1/8 Male Quick Connect) and a 15/16" Standard Open Plug part #O20. O575 requires an 1-1/2" Standard Open Plug # O45 and parts O585, O590, O595 require Standard Open Plug # O90.