I need to pres test a commercial system with a pit and 3 plunger valves. The valves are not holding 100% of the water.I need to plug the T were they enter the pit. Any suggestions?
Also I have three valves entering the pit. 1 Main drain 2 is gutters 3 says recirculting suction where and what does 3 go and do?:

#3 recirculates water in pit