pump or via other inflation means known by those skilled in the art preferably the bladder 20 is inflated to an internal pressure which is greater than the testing pressure so as to anchor the bladder 20 firmly within the fluid duct 16 during testing the method further includes directing the pressurized test media 14 into the fluid system 12 via the test fluid delivery tube 24 the pressurized test media 14 may be directed into the fluid system 12 by connecting the test fluid delivery tube 24 to testing device when the bladder 20 is inflated and the pressurized media 14 is directed into the fluid system 12 a pressure differential may be created within the fluid duct 16 on opposed sides of the bladder 20 in particular the pressure within the fluid duct 16 on the downstream side of the bladder 20 e g the side to which the pressurized media 14 is emitted is greater than the pressure within the fluid duct 16 on the opposed side of the bladder 20 the fluid tight seal between the bladder 20 and the duct 16 allows the creation of the pressure differential for conducting the fluid integrity testing it is contemplated that the fluid integrity testing.